Elf Qrin's Cyber Lab

since 1999


File formats and extensions
v3.0 r23may2016
#
###Temporary fileProgram-dependent format
#24Printer data file for 24-pin matrix printerLocoScript
#IBPrinter data fileLocoScript
#nnPart of file imageLong
#SCPrinter data fileLocoScript
#STStandard mode printer definitionsLocoScript
$$$OS/2 archive file (i.e. archives$.$$, keys$.$$)OS/2
$$$Temporary file
$?ZX Spectrum file in HOBETA format
$00Pipe fileDOS
$DBTemporary filedBASE IV
$EDEditor temporary fileMS C
$O1Pipe fileDOS
$VMVirtual manager temporary fileWindows 3.x
)2(LHA archiver temporary fileLHA
??$Backup fileP-CAD
??_Microsoft packed fileExpand
?DKDisk imageLoaddskf.exe
?UTNonpacked FTN mail (? - flavor)FidoNet
!qBUnfinished qBittorrent downloadqBittorrent
!utUnfinished µTorrent downloadµTorrent
___Adinf tableAdinf
EX_Compressed executable fileNote: EX could be any first two characters in a file extension (e.g. BM_ for compressed bitmap (BMP), DL_ for compressed library, etc.) Files compressed using this method have been in use on Microsoft software CDs and floppies since around 1995.
?Q?SqueezeCP/M and MS-DOS
~$~Temporary file1st Reader
~1~, ~2~, etc.Backup file (name is constructed with numbered backup option by appending ~, the incremented number, and another ~ after the original name)GNU coreutils (cp, install, ln, mv ), Emacs
~??Old Backup files (.MNU to .~MN)Resource Workshop (Borland Delphi)
~HCardfile heapAZZ Cardfile
µMetrowerks Codewarrior project
?THINK C project
0-9
0Compressed harddisk dataDoubleSpace
0BPrinter font with lineDraw extended character setPageMaker
001, 002, ...Split parts of a single whole fileFFSJ, HJSplit, JJSplit, split (Unix) (when using numeric suffixes)
1Fax(Many programs)
1Roff/nroff/troff/groff source for manual pagecawf2.zip
123SpreadsheetLotus 1-2-3 version 9 and version 97
123dxCAD drawing fileAutodesk 123D design file, a ZIP file format package containing a .sat file and .png thumbnails.
15UPrinter font with PI font setPageMaker
16SYSLINUX Splash Screen GraphicSYSLINUX, XnView
1STUsually README.1ST text file
1TX1toX Logipole file
2GR286 Grabber FileWin
301FaxSuper FAX 2000 - Fax-Mail 96
386Intel 80386 processor driverWindows 3.x
386Windows virtual device driverWin
3DMFQuickDraw 3D MetafileQuickDraw
3DS3D Studio Graphics format3D Studio
3DTDatabase in which the meta-data of a 3D Topicscape is held3D Topicscape
3DV3-D wireframe graphics by Oscar Garcia3dv wireframe viewer
3FXEffectCorelChart
3GAMobile Phone Audio (Samsung)
3GPMobile Phone Video
3GR386 Grabber FileWin
3T4Binary file converter to ASCIIUtil3
4DB4D Structure File4D
4DD4D Data File4D
4DIndy4D Structure Index File4D
4C$Datafile4Cast/2
4MDMusical file
4SW4DOS Swap File4DOS
4THFORTH source code fileForthCMP - LMI Forth
55516 bit per pixel image file format (5bit per component)Sierra Entertainment
602Text (fairly simple format, plain text with binary control commands embedded within text lines and special formatting commands on dedicated lines)Text602 text processor by Software602
668Music (the mixing is always at 12048 Hz)
669Music (8 channels)The 669 Composer
6CMMusic (6 Channel Module)Triton FastTracker
7575×75 dpi display fontVentura Publisher
7zA compressed archive file format that supports several different data compression, encryption and pre-processing algorithms7-Zip
8A86 assembler source code file
8585×85 dpi display fontVentura Publisher
8BFAdobe Photoshop compatibile filters/plugins
890ScanTitling subtitle files
8CMMusic (8 Channel Module)Triton FastTracker
8MPrinter font with Math 8 extended character setPageMaker
8UPrinter font with Roman 8 extended character setPageMaker
83pExecutable program for TI-83 Plus Graphing CalculatorTI Connect
89pExecutable program for TI-89/89 Titanium Graphing CalculatorTI Connect
8xpExecutable program for TI-83/84 Plus Graphing CalculatorTI Connect
9191×91 dpi display fontVentura Publisher
9696×96 dpi display font
A
AADA source code file
ALibraryUnix
A##AlZip Compressed Files' pieces
A11Graphics AIIM image file
A2WWorld file for Alice programming language, version 3.1
A80Assembler language source for 8080
AA, AB, ...Split parts of a single whole filesplit (Unix)
AACAdvanced Audio Coding, a standardized, lossy compression and encoding scheme for digital audio
AAFAutoPatcher file
AAFAdvanced Authoring Format, an advanced media wrapper file for professional applications
AASAnimation Play ScriptAAPlay
ABAndroid adb Backupadb
AB6DatafileABStat
AB8DatafileABStat
ABCAlembic - 3D geometry / modelsMany Computer Graphics tools, see Alembic (Computer Graphics) for a list.
ABCDocumentABC FlowCharter 1.0
ABCMusic in ABC formatMainly Video Games
ABPDataABComp compressed
ABPAVS Barcode ProfileAVS Barcode Source
ABFAdobe Binary Screen FontAdobe Systems Software
ABKAutomatic backup fileCorelDRAW
ABMImage PALS album file
ABMAlbum file (various programs)
ABRAdobe Brush file for PhotoShopPhotoShop
ABSAbstracts (info file)
ABSData fileAbscissa
ACProject backupAudit Command Language (ACL)
ACAProjectProject Manager Workbench
ACBArchiveACB
ACBsee ACMB
ACCProgram (DR-DOS - ViewMax)GEM / resident
ACCDADataMicrosoft Access Database Wizard (Open XML)
ACCDBDataMicrosoft Access Database (Open XML)
ACCDEDataMicrosoft Access Database Wizard (Open XML)
ACCDTDataMicrosoft Access Database Template (Open XML)
ACCDUDataMicrosoft Access Database Wizard (Open XML)
ACCFTMicrosoft Access Data Type Template[1]Microsoft Access
ACEArchiveACE
ACFAdobe Custom Filter for PhotoShopPhotoShop
ACLProjectAudit Command Language (ACL)
ACLAutoCorrect ListMicrosoft Office
ACMAudio Compression Module add-onWin
ACMBGraphics file
ACOAdobe Color PaletteAdobe
ACTACTOR source code fileACTOR
ACTAnimations Works Actor (Graphics cell)Animation Works
ACTFoxDoc Action DiagramsFoxPro
ACTPresentationAction!
ADAfterDark screensaver moduleAfterDark
AD2ADPCM 2-bit compressed voice fileZFAX
AD3ADPCM 3-bit compressed voice fileZFAX
ADAAda source code file
ADBAda Package Body
ADCBitmap graphics (16 colors)Scanstudio
ADCDictionaryLingvo
ADDOS/2 adapter device driver
ADFAmiga Disk FileunADF, UAE, WinUAE etc...
ADGDataADG 3D Scene
ADIGraphics fileAutoCAD
ADIDatabase Index FileAdvantage Database Server
ADICHTLabChart data acquisition fileADInstruments
ADLMCA adapter description libraryQEMM
ADMAfter Dark support fileAfterDark
ADMADEM file formatADEM
ADIDatabase Memo FileAdvantage Database Server
ADNAdd-inLotus 1-2-3
ADRAfter Dark support fileAfterDark
ADSAda Package Specification
ADTWoW geographical map location fileBlizzard Entertainment games (various)
ADTDatafile for cardfile applicationHP NewWave
ADTAbrechnungsdatentransfer, an xDT applicationHealthcare providers in Germany
ADTDictionaryLingvo
ADTFaxAdTech
ADIDatabase TableAdvantage Database Server
ADVGUS device driverGf166.com
ADXDocumentArchetype Designer
ADZAmiga Disk Zipped (See Amiga Disk File)GZip
AEPAfter Effects Project FileAdobe After Effects
AESFile encrypted using the Advanced Encryption Standard (AES)AES Crypt (Windows, Mac, Linux, Java) and Crypt4All (Android)
AF2FlowchartABC FlowCharter 2.0
AF3FlowchartABC FlowCharter 3.0
AFITruevision bitmap graphics
AFLFont file (for Always)Lotus 1-2-3
AFMDatafile for cardfile applicationHP NewWave
AFMType 1 font metric ASCII data for font installerATM - many
AFPShape paletteABC FlowCharter
AFTTemplateABC FlowCharter 3.0
AFWWorkplaceABC FlowCharter 3.0
AGRArcView ASCII grid
AHKAutoHotkey script fileAutoHotkey
AIAdobe Illustrator ArtworkAdobe Illustrator
AIFsee AIFF
AIFCAudio Interchange File Format with Compression
AIFFAudio Interchange File FormatConvert (c) Villena
AiMAsm Text Mode Image FileThe Ultimate Draw
AINArchiveAIN
AINJob scheduleAutoIntern
AIOAPL programming language file transfer format file
AIRAdobe AIR installation packageThe Adobe AIR runtime environment
AISArray of Intensity Samples graphics fileXerox
AIXDatafile for cardfile applicationHP NewWave
AKM"Akai Multitimbral" sample information fileAkai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
AKP"Akai Program" sample information fileAkai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
ALCMolecular coordinatesAlchemy, RasMol
ALGActivity LogARCSOLO
ALEAvid Log Exchange (used in film & video editing)Avid
ALLArts & Letters symbol and font filesArts & Letters
ALLFilelist w/ all filesFRQView
ALLFormat file for working pagesAlways
ALLGeneral printer informationWordPerfect for Win
ALOAlmanac support file
ALTMenu fileWordPerfect Library
ALZAlZip Compressed Files
AMDMaxum chromatograph offline databaseSiemens Maxum Chromatograph
AMFMusic (Advanced Module Format)DMP
AMGArchiveAMGC
AMGSystem image fileACTOR
AMLAutomationMLAutomationML Group
AMPLAMPL source code fileAMPL
AMRAudio format for mobile phones (Nokia, SonyEricsson)
AMSAdobe Monitor Setup calibration filePhotoShop
AMSMusic format
ANIAnimation cursors for WinWin95 - WinNT
ANIAnimationIconAuthor
ANMAnimationDeluxe Paint Animator
ANIMTrainz Animation specification file, for example a steam locomotive's connecting rod movements, or water movement on a river or lake motion. (Obsolescent)Trainz/Auran JET files
ANNAnnotations of old Windows Help fileWindows 3.0 - XP
AnnMulti volume ARJ archiveARJ
ANSANSI character graphics (animation) fileANSView
ANSASCII text ANSI character setNewWave Write
AOLAmerica On-line for Windows DLLWin
AOSAdd-On SoftwareNokia 9000
APArchiveWHAP
APDatafileDatalex EntryPoint 90
APCPrinter driverLotus 1-2-3
APDPrinter driverLotus 1-2-3
APEMonkey's Audio (Lossless)audio media players
APFPrinter driverLotus 1-2-3
APIAdobe Printer Ink file for PhotoShopPhotoShop
APIPassed parameter file1st Reader
APIPrinter driverLotus 1-2-3
APKAndroid ApplicationAndroid
APLAPL work space format file
APLSupport module used by Manugraphics APL products
APLEV-Dos Application File
APMAuthorware MacintoshAuthorware
APPAdd-in application fileSymphony
APPApplication object filedBASE Application Generator
APPApplicationFoxPro
APPApplication and Application BundleMac OS X
APPExecutable workflow / macro fileAutomator
APPExecutable application fileDR-DOS - NeXTstep - Atari
APPGenerated applicationFoxPro
APREmployee performance reviewEmployee Appraiser
APWAuthorware WindowsAuthorware
APXAppexpert database fileBorland C++ 4.5
AQFAnalyzer Queries and FiltersActix
ARArgon - for 3D ModelingAshlar-Vellum
AR7ArchiveAR7
ARCArchiveARC - PKARC/PKXARC - PKPAS - PKUNPAK - QUARK
ARCArchiveSQUASH
ARCNintendo proprietary archive formatVarious Nintendo games
ARDMapHolux - Alan
ARFAutomatic Response File
ARHArchivers definitions fileDN
ARIArchiveARI
ARJArchiveARJ - ARJZ
ARKARC archiveCP/M port of ARC file archiver
ARKArchiveQUARK
ARKManaging your Money Archive File
ARRArrangementAtari Cubase
ARTGerber artworkCadence Allegro
ARTFirst Publisher, Designworks, Greenstreet Draw graphic fileAll GST/Greenstreet Draw products
ARTGraphics (scrapbook)Art Import
ARTGraphics format (Another Ray Tracer)PFS:1st publisher - Art Import
ARTXfile formatArtisteer
ARTXfile formatbelightsoft Text Art
ARXArchiveARX
ASCASCII text file
ASCTransport armor filePGP
ASDAutosave fileMicrosoft Word
ASDPresentationAstound
ASDScreen driverLotus 1-2-3
ASDSpectral Data SetASD Inc. RS3 spectral acquisition program
ASEVelvet Studio SampleAWAVE
ASEASCII Scene Export3D Studio
ASFDatafile (APL Shared File)STATGRAPHICS (APL*Plus/PC)
ASFScreen fontLotus 1-2-3
ASFAdvanced Streaming Format (Compressed Windows audio/video)Microsoft Corporation
ASKSYSGEN answer fileRT-11
ASHAssembly language header fileTASM 3.0
ASIASIC language sourceASIC
ASIAssembler include fileTurbo C - Borland C++
ASMAssembler language sourceTASM, MASM, NASM, Yasm, FASM
ASMXASP.NET Web ServiceMicrosoft Corporation
ASOAssembler object (object-oriented) fileTurbo Assembler
ASPASPECT source code fileProcomm Plus
ASPAssociation of Shareware Professionals OMBUDSMN.ASP notice
ASPActive Server Pages of Microsoft.NetMicrosoft Corporation
ASPXActiveX Server Pages of Microsoft.NetMicrosoft Corporation
ASSAmalgam Scene SpecificationHalo 2 Map Editor
ASSAdvanced SubStation Alpha (Subtitles)
ASTAdobe Color Separation table for PhotoShopPhotoShop
ASTNintendo proprietary music streaming formatVarious Nintendo games
ASVAutosave FileMATLAB
ASWAuthorware StarAuthorware
ASXAdvanced Stream Redirector file, redirects to an ASF file (see ASF)Microsoft Corporation
ASZSkinAltDesk
AT2Auto templateAldus Persuasion 2.0
AT3Atrac 3 Sound/music fileAll Sony devices and programs with the Atrac 3+ specification
ATMAdobe Type Manager data/info
ATNAdobe Photoshop actionAdobe Photoshop
ATTAT&T GroupGCGW
ATTFAramOS TypeAtor Text FileAramOS TypeAtor 1.0 (Development State)
ATYProduced when an association type is exported by 3D Topicscape3D Topicscape
AUSun/NeXT/DEC Audio fileAWAVE, GoldWave
AUSound (audio) fileSun Microsystems - Convert (c) Villena
AUDAudio fileAudioRack
AUPAudacity project fileAudacity
AUSKedit AutoSave fileKedit
AUXAuxiliary dictionaryChiWriter
AUXAuxiliary referencesTeX/LaTeX
AUZAbleton Live FileAuthorization File for Ableton Live
AVAPublicationAvagio
AVBAntiViral Toolkit Pro Bases
AVIAudio Video Interleaved animation fileVideo for Windows
AVRAudio Visual ResearchAWAVE
AVSAudio Video SoftwareAVS Video Editor (video editing software)
AVTAVATAR-coding filesA3E
AWText fileHP AdvanceWrite
AWProprietry Nintendo wave formatVarious home console Nintendo games
AWAAnimations Works Accelerated MovieAnimation Works
AWDMicrosoft Fax At Work DocumentMicrosoft Fax At Work
AWKAWK script/programawk, GNU Awk, mawk, nawk, MKS AWK, Awka (compiler)
AWMAnimations Works Movie (as .AVI)Animation Works
AWSData (APL Workspace)STATGRAPHICS (APL*Plus/PC)
AxDirectshow filter file format
AXFARM Executable Image generated by the ARM tools
AXF"lightweight geodatabase" [1]ESRI ArcPad
AXMAxmedis objectAxmedis Tools
AZDAmazon Software DownloadAmazon Software Download
AZWDRM enabled eBookAll models of Amazon Kindle
AZW1DRM enabled eBook with embedded fontsAll models Amazon Kindle
AZW2Program fileAll models of Amazon Kindle excluding Kindle 1
AZZData fileAZZ Cardfile
B
B1Archive file formatB1 Free Archiver
B&WBlack and white graphics fileatari - mac
B&WMono binary screen image1st Reader
BBatch listAPPLAUSE
BGrand Theft Auto saved gameAny of the 3D Grand Theft Auto games in either III or IV era.
B_WBlack and white graphics fileAtari - mac
B1NBoth mono and color binary screen image1st Reader
B30Printer font (JLaser - Cordata)Corel Ventura Publisher
B3DBlitz3D filesBlitz3D
B8Raw graphics file (one byte per pixel) plane twoPicLab
BABinary ArchiveScifer Archiver and Compression [External Header Mode]
BACCompiled BASICRT-11 BASIC-11
BADBad fileOracle Corporation - many
BADAnimation fileNovalogic
BADFile which covers bad blocks on disk volume (not to be moved)RT-11
BAKBackup file
BALMusic scoreBallade
BALANCEBalance accounting sheet fileBalance
BAPBlaze Audio Wave Information FileBlazeAudio MadCap Software
BARHorizontal bar menu object filedBASE Application Generator
BARInfo Bar for GFX2EXEGFX2EXE
BARBroker Archive. Compressed file containing number of other files for deployment.[2]IBM WebSphere Message Broker
BASBASIC language sourceQuickBASIC - GW-BASIC - FreeBASIC
BATBatch fileMS-DOS, RT-11
BBDatabase backupPapyrus Design Group
BBLBibliographic reference fileTeX/BibTeX
BBMBrushDeluxe Paint
BBPPlaylistBassBox
BBQBitBeamer Transfer Queue fileBitBeamer
BBSBulletin Board System announce or text info file
BBSHudson-style messagebaseFTN software
BC!Unfinished downloadUnfinished BitComet download (a BitTorrent client)
BCDBoot Configuration DataWindows Vista and later, Registry Editor
BCFCard dataBingo Card Creator
BCHBatch process object filedBASE Application Generator
BCHDatafileDatalex EntryPoint 90
BCOOutline font descriptionBitstream Inc.
BCPBorland C++ makefile
BCTBackup dictionaryClarion
BCWEnvironment settingsBorland C++ 4.5
BDBBookends databaseBookends
BDCDictionaryLingvo
BDEFBuilder DefinitionWebsphere Portlet Factory
BDFAdobe Glyph Bitmap Distribution FormatAdobe Software
BDFBinary update fileBUPDATE.EXE (c) TNT Techn.
BDFBitmap Distribution Format font fileX11
BDFDatafileEgret
BDMVideoclipAVCHD
BDMVBlu-ray Video Data Content fileMedia players / software that supports Blu-ray structure
BDRBorderMicrosoft Publisher
BDTDictionaryLingvo
BDTBehandlungsdatentransfer, an xDT applicationHealthcare providers in Germany
BEFBleck Encrypted File
BEMBIM Cost estimating fileBIMestiMate
BEZOutline font descriptionBitstream
BFBrainfuck sourcefile
BF2Bradford 2 font
BFCBriefcase Win95Win95
BFMFont metricsunix/Frame
BFSBinary File Storage
BFXFaxBitFax
BGABitmap graphics
BGIBorland Graphics Interface device driverTurbo C - Turbo Pascal
BHBlackholedata compression format
BIBASIC include fileVisual Basic - FreeBASIC
BIBBibliography (ASCII)
BIBDatabase - not compatible with TeX formatPapyrus
BIBLiterature databaseTeX/BibTeX
BIFBinary Image Format b&w graphics fileImage Capture board
BIKBink video file (RAD Video)
BIMBuilding Information ModelingArchiCAD / Autodesk Revit
BINBinary file, usually zero-start (.com analog)
BINSGI Powerflip
BINText mode memory dumpThe Draw - TUD - ACiDDraw - etc.
BIOBioniX Wallpaper playlist fileBioniX Wallpaper Changer
BIOOS/2 BIOS
BITBitmap X11
BK!Document backupWordPerfect for Win
BKFaxbookJetFax
BK?Backup file
BKCBackup catalogBackup4all
BKFBackup archiveWindows NTBackup Utility
BKnTimed backup file for document window nWordPerfect for Win
BKPBackup fileWrite - TurboVidion DialogDesigner
BKWMirror image of font setFontEdit
BLDBLoaDable pictureBASIC
BLDSYSGEN Build procedure fileRT-11
BLENDBlender3D Project FileBlender
BLGBackup LogARCSOLO
BLKTemporary fileWordPerfect for Win
BLOBUnknownSteam (software) for Win
BLPBlizzard Game PictureBlizzard Entertainment games (various)
BMBitMap graphics file
BM3UIQ3 Phone backup
BMDNintendo proprietary 3D model fileVarious Nintendo games
BMKBookmark of old Windows Help fileWindows 3.0 - XP
BMPOS/2 or Win graphics format (BitMap Picture)QPeg - CorelDraw - PC Paintbrush - many
BMPWbitmap world-file - geo-references info
BMSNintendo proprietary MIDI tracker formatVarious Nintendo games
BMTAmi Pro ButtonAmi Pro
BNADataAtlas Boundary
BNKAdlib instrument bank file
BNRGraphics BannerBanner - Poster
BOBFile archive for Lego Island 2Lego Island 2
BODStores paths to game files in a BOB archiveLego Island 2
BOKShamela Library bookShamela Library Program
BOOBook-formatREADIBM
BOOCompressed file ASCII archive created by BOO (msbooasm.arc)msbooasm.arc
BOOBoo programming language source fileBoo Programming Language
BOTBot files, these go with JKB filesQuake 3 Engine
BPCChartBusiness Plan Toolkit
BPOLYDataPrisms binary 3D object
BPPBackup applicationClarion
BPTBitmap fills fileCorelDRAW
BPWBitser proprietary encrypted password fileBitser password manager
BRScriptBridge
BRDEagle Layout File
BRDTanzzle board fileTanzzle
BRDCadence Allegro board fileCadence
BRFBrailleBraille embossers and refreshable displays
BRKFaxBrooktrout Fax-Mail
BRKThe Brake! Mailer REXX scriptThe Brake!
BRLCADBallistic Research Laboratory CAD
BSBoot sector fileSYSLINUX
BS2ArchiveBS2.EXE
BSAArchiveBSArc
BSCCompressed Apple II file archive created by BINSCIIBINSCII
BSCDatabaseSource Browser
BSCPwbrmake object fileMicrosoft Fortran
BSPGoldSource/Source engine map filesValve Corporation
BSPid Tech map filesid Software
BSSboot sector (DOS) fileSYSLINUX
BSSCasio Phone basePC-LINK
BSTBiblioTex file (BiblioTex=bibliography file)TeX
BSYBusy flagFTN soft
BTMBatch-to-memory (quick batch)4dos -ndos
BTNMakeover Button file
BTXbackup of 4DOS batch files (_4INST.BTM)4DOS
BUFRBinary Universal Form for the Representation of Meteorological Data
BUGBugs and Problems
BUNLucasArts Bundle File
BUPBackup file
BUTButton definitionsButtons!
BUYDatafile formatmovie
BVnOverflow file below insert point in Doc nWordPerfect for Win
BWBSpreadsheet applicationVisual Baler
BWRBeware (buglist)Kermit
BYKBYK Compressed FileBYK
BYUBYU MovieBYU
BZ2Archivebzip2
BZMMapBlitzkrieg
BZNMap fileStar Trek Armada II Fleet Operations map file
C
C--C-- language sourceSphinx C--
CC language source. Note that on case-sensitive platforms like Unix and with the gcc compiler the uppercase .C extension indicates a C++ source file.Watcom C/C++, Borland C/C++, gcc and other C compilers
CUnix file archiveCOMPACT
C++C++ language source
C00Print fileVentura Publisher
C01Typhoon wave filesAWAVE
C32COMBOOT Executable (32-bit)SYSLINUX
C86C source code fileComputer Innovation C86
CAInitial cache data for root domain serversTelnet
CA?Borland packed and split fileBorland Installer
CABWin 95 packed fileWin 95
CACdBASE IV executable when caching on/off (see cachedb.bat)
CADDrawingBobCAD-CAM
CADDocumentDrafix Windows CAD
CALCalendar fileWindows 3.x
CALSpreadsheet formatSuperCalc
CALSComputer Aided Acquisition and Logistics
CALSSupport Raster Format
CAMCasio Camera
CANFaxNavigator Fax
CAPCaptionVentura Publisher
CAPCapture fileProComm - Telix
CASC + ASM language sourceTurbo C
CATCatalogCP Backup - dBASE IV
CATDevice driver digital signatureMicrosoft Windows
CATStellarium Star CatalogueStellarium
CATDrawingDrawing file of CATIA V5CATIA V5
CATPartPart file of CATIA V5CATIA V5
CATProductAssembly file of CATIA V5CATIA V5
CATSCombined sourceATS
CBASource codeCreative BASIC
CBCFuzzy logic systemCubiCalc
CBLCOBOL source code file
CBMCompiled bitmap graphicsXLib
CBRComic Book Reader (RAR file)CDisplay and similar
CBSMasterWord button bar configuration file
CBTCOMBOOT Executable (incompatible with DOS COM files)SYSLINUX
CBTComputer Based Trainingmany
CBZComic Book Reader (ZIP file)CDisplay and similar
CCC++ source code file
CCCC language sourceCC
CCCBitmap graphics (native format)Curtain Call
CCDtext metadata for CD/DVD imagesCloneCD Control File
CCFCommunications configuration fileSymphony
CCFColor Chat fileColor Chat File
CCHChartCorelChart
CCITTCCITT Group 3 and Group 4 Encoding
CCLCommunication Command Language fileIntalk
CCOBTX Graphics fileXBTX
CCTPrint TemplateBobCAD-CAM
CDCD descriptionDN
CDACD-AudioWin95
CDBCard databaseCardScan
CDBMain databaseTCU Turbo C Utilities
CDFCommon Data Format
CDFCompany Data FileNominal Small Business Accounting software
CDFComputable Document FormatMathematica
CDFCyberspace Description Format
CDFGraphicsnetcdf
CDKDocumentAtari Calamus
CDLCADKey CADL LanguageCADKey
CDMDisk Drivers NPANovell NetWare
CDMMusic format (compressed)
CDOMusic notationCrescendo Music Notation Editor
CDRVector graphics format (drawing)CorelDraw!
CDTCorel Draw Template FileCorelDraw!
CDXCompound index fileVisual FoxPro, Advantage Database Server
CEComputer EyesConversion Artist
CEMain.ceThe FarSide Computer Calendar
CEBCont. Edge BitmapConversion Artist
CEFCA-Clipper Workbench ApplicationCA Clipper
CEFExport File
CEFCompact Embedded FontAdobe Illustrator
CEGBitmap graphicsTempra Show - Edsun Continuous Edge Graphics
CELAnimation CEL3D Studio
CELGraphicsAutodesk Animator - Lumena
CFConfiguration fileimake
CFAAudio fileAdobe Premiere Pro
CFCColdFusion ComponentAdobe ColdFusion
CFGConfiguration file
CFLChartCorelFLOW
CFMColdFusion Markup LanguageAdobe ColdFusion
CFNFont dataAtari Calamus
CFOC Form Object internal format object fileTCU Turbo C Utilities
CFPFaxThe Complete Fax Portable
CFTCFast graphics fileDisney Animation Studio
CGACGA display fontVentura Publisher
CGICommon Gateway Interface script
CGMComputer Graphics Metafile vector graphicsA&L - HG - many
CHClipper language headerCA Clipper
CH3ChartHarvard Graphics 3.0
CH4PresentationCharisma 4.0
CHDFont descriptorFontChameleon
CHIChiWriter DocumentChiWriter - Chiview
CHKRecovered dataDOS CHKDSK
CHKTemporary fileWordPerfect for Win
CHLConfiguration History Log
CHMCompiled Help FileMicrosoft Windows, Help Explorer Viewer
CHMLEncrypted Data FileKrasbit Technologies, Chameleon Imaging Workflow Software
CHNDataEthnograph 3
CHPChapter fileVentura Publisher
CHRCharacter setTurbo C - Turbo Pascal
CHTChartHarvard Graphics 2.0 - SoftCraft Presenter
CHTCHeaT in any program/gamemany
CHTInterface file for ChartMasterdBASE
CHZArchiveCHARC
CIFCaltech Intermediate Format graphics file
CIFChapter informationVentura Publisher
CIFCrystallographic Information FileRasMol, Jmol
CiMC Text Mode Image FileThe Ultimate Draw
CIXDatabase indexTCU Turbo C Utilities
CKBBorland C++ 4.x editor keystroke mappingBCW.EXE
CLCOMMON LISP source code file
CLASourceClarion
CLASSJava class fileJava
CLDClipper debugger configuration fileCA Clipper
CLJClojure source codeClojure
CLPClip art graphics fileQuattro Pro
CLPClipboard fileWindows 3.x
CLPCompiler response fileCA Clipper
CLPGraphics formatPCPAINT/Pictor
CLPIClipAV Clip Information file for Blu-rayMedia hardware / software with Blu-ray structure support
CLPRJClassicLadder project fileClassicLadder
CLRColor binary screen image1st Reader
CLRColor definitionsPhotostyler
CLRColor schemeBoxer/2
CLRPalette file for GIS format
CLSC++ class definition file
CLWMFC Class Wizard informationMicrosoft VC++
CMData fileCraftMan
CMBXtree for Windows Button Bar file
CMDCommanddBASE - Waffle
CMDCommand Prompt batch fileMicrosoft Windows NT based operating systems
CMDexecutable programsCP/M-86 operating system
CMDExternal command menu1st Reader
CMDOS/2 batch/REXX fileOS/2
CMFFM-music file (Creative Music File)
CMKCardCard Shop Plus
CMMCMM script (batch) fileCEnvi
CMPBitmap graphics (Lead CMP compression)
CMPCompressed dataPKWare Inc. data compression library
CMPHeader file for PostScript printer filesCorelDRAW
CMPPhotofinish Calibration MapPhotofinish
CMPUser dictionaryMicrosoft Word for DOS
CMRLConcise message routing languageDOTGO
CMSContent Management SystemAny Web Browser
CMUCarnegie Mellon University Formats
CMVAnimation (CorelMove CorelDraw 4.0)CorelMove CorelDraw 4.0
CNCCNC general program data
CNDSystem generation conditional fileRT-11
CNFConfiguration (program - printer setup)program - printer setup
CNFConfiguration file
CNTcontents table of old Windows Help fileWindows 3.0 - XP
CNVTemporary fileWordPerfect for Win
CNVWinword DLL used as part of an import operation (CNV=converter)Microsoft Word
COCobalt - parametric drafting and 3D modelingAshlar-Vellum
COBCalgari trueSpace2 File Format
COBCOBOL source code file
CODCode definition tableUUPC
CODDatafileForecast Plus - Microsoft Multiplan - StatPac Gold
CODfile including CODES for any program/gamemany
CODPrinter code definition fileBoxer/2
CODProgram compiled codeFORTRAN
CODTemplate source filedBASE Application Generator
CODVideotext file
COECoefficient fileXilinx ISE
COFAnimation Control FileDiablo II
COFFEECoffeeScript source code file
COLColor paletteAutodesk Animator - many
COLSpreadsheetMicrosoft Multiplan
COLDIMACS graph data stores a single undirected graph (text and binary variants)
COMCommand (memory image of executable program)DOS
COMIndirect command file (sequence of commands to be executed)RT-11
CONConfiguration fileSimdir
CONMSTS Consist fileMSTS
CPCCompressed imageCartesian Perceptual Compression
CPDScriptComplaints Desk
CPFFaxThe Complete Fax
CPIColorLab Processed Image bitmapped graphics file
CPIMS-DOS codepage fileMODE.EXE
CPLControl panel fileWindows 3.x
CPLPresentationCompel
CPMZConPro/Miradi ZipfileMiradi and ConPro
CPPC++ language sourceWatcom C/C++
CPPPresentationCA-Cricket Presents
CPRKnowledge AccessGCGW
CPRCubase Project FileSteinberg Cubase
CPSbackup of startup files by QEMM (?) autoexec.cps
CPTEncrypted memo filedBASE
CPTMac file archiveCOMPACT PRO
CPTTemplateCA-Cricket Presents
CPZMusic text fileCOMPOZ
CR2Raw image formatCanon digital cameras
CRAAdvanced crack file (usually text)
CRDCardfileWindows 3.x - YourWay
CRDMapHolux - Alan
CRDMolecular coordinatesCHARMM, RasMol
CRDOWNLOADGoogle Chrome download in progressGoogle Chrome
CRFCross-referenceMicrosoft MASM - Zortech C++, RT-11 CREF
CRKCrack file (usually text)
CRPEncrypted databasedBASE IV
CRSFile Conversion ResourceWordPerfect 5.1
CRTTerminal settings informationOracle
CRUCompressed file archive created by CRUSH
CRWCrossWords document file
CSC# source fileC#
CSDCompact Shared DocumentDream To Reality
CSGBatch file (Submit)ISIS/w
CSGGraphStatistica/w
CSMBorland C++ 4.x precompiled header fileBCW.EXE
CSPPC Emcee Screen Image fileComputer Support Corporation
CSSDatafileCSS - Stats+
CSSDatasheetStatistica/w
CSScascading style sheet
CSVAdjusted EGA/VGA paletteCompuShow
CSVComma Separated Values text file format (ASCII)
CTCControl filePC Installer
CTFCharacter code translation fileSymphony
CTKCommonTime Key fileCommonTime software applications
CTLControl filedBASE IV - Aldus Setup
CTLBATCH control file (generated by BATCH from .BAT file)RT-11
CTTBATCH Temporary fileRT-11
CTXCiphertext filePretty Good Privacy RSA System
CTXCourse TeXt filesome Microsoft online guides
CTXdocumentCreativyst Table eXchange
CUFC Utilities Form definitionTCU Turbo C Utilities
CURWindows resource (cursor image file)Resource Workshop - WRT - Watcom Resource Editor
CUTGraphics format (bitmapped graphics)dr. Halo
CV4Color fileCodeView
CVPCover pageWinFax
CVSGraphicsCanvas
CVTBackup file for CONVERTed database filedBASE IV
CVWColor fileCodeView
CWEBC Web
CWKDatafileClarisWorks, Appleworks
CXXC++ source code fileZortech C++
CYSCytoscape session fileCytoscape
D
DD Programming Language source fileDMD
D3VVideo fileNintendo DS (with ARME, MMCF etc.)
D4DDataDraw 4D object
D4PDataDraw 4D Pro object
D64Commodore 64 disk image
D88Toshiba Pasopeia D88 disk image formatA series of emulators of Japanese computers
DAADirect Access Archive
DAECOLLADA file
DAFData fileDigital Anchor
DATAMPL data fileAMPL
DATMaxum chromatograph chromatogramSiemens Maxum Chromatograph
DATLDraw (Sub)Part File, 3D ModelLDraw
DATDocumentMicrosoft Word Format (old)
DATdataRSNetWorx Project
DATData file in special format or ASCII
DATDatabase fileClarion (programming language)
DATNorton Utilities disc image data. It saves Boot sector, part of FAT and root directory in image.DAT on same drive.Norton Utilities
DATOptical disc image (can be ISO9660, but not restricted to)cdrdao, burnatonce
DATVideo CD MPEG stream
DATWindows registry hive (REG.DAT Windows 3.11; USER.DAT and SYSTEM.DAT Windows 95, 98, and ME; NTUSER.DAT Windows NT/2000/XP/7)Microsoft Windows
DATMinecraft game dataMinecraft
DATSDynamic sourceATS
DAVProprietary DVR formatRecorded encrypted video from digital video recorders DVR365 or AlienDVR series[3]
DB$Temperature debug infoClarion Modula-2
DB$Temporary filedBASE
DBDatabase fileParadox - XTreeGold - dbvista - Oracle - XoftSpySE - Windows thumbnail cache[4][5]
DBConfigurationdBASE IV - dBFast
DBMulti Edit configME
DB2DatabasedBASE II
DB3DatabasedBASE III
DBADatabase fileTurbo Prolog - DataEase
DBADarkBasic source code
DBCDataBaseContainerVisual FoxPro
DBDBusiness dataBusiness Insight
DBDDebug infoClarion Modula-2
DBFDatabase filedBASE III/IV - Visual FoxPro - dBFast - DataBoss - DBVista - CA-Clipper - Visual Objects - Alaska Xbase++ - Advantage Database Server
DBFXDevBox Database FilePudince Devbox
DBGDebugger scriptDOS debug - Watcom debugger
DBGSymbolic debugging informationMicrosoft C/C++
DBKDatabase backupdBASE IV
DBLDIBOL source file
DBMDatafileDataEase
DBMMenu templateDataBoss
DBOCompiled programdBASE IV
DBProDarkBasicPro Project
DBSData file used by Managing Your Money
DBSDatabase in SQL Windows format
DBSDatafilePRODAS
DBSPrinter description fileMicrosoft Word, Microsoft Works
DBTFoxBASE+ style memoFoxPro 2.x
DBTMemo file for database w/same namedBASE IV - dBFast
DBWWindows fileDataBoss
DBXDataBeamGCGW
DBXAutoCAD DatabaseAutoCAD
DBXArchive FileOutlook Express
DCCAD drawing fileDesignCAD 3000 for Windows
DC6Image fileDiablo II
DCADocument Content Architecture text fileIBM DisplayWrite
DCCAnimationDiablo II
DCDCAD Drawing FileDesignCAD 3DMax for Windows
DCFfloppy disk imageDisk Copy Fast
DCHSchematic Drawing fileDipTrace Schematic Capture
DCIDreamcast Save FileDreamcast
DCLDelphi Control LibraryBorland Delphi
DCMDCM music moduleAWAVE
DCPOS/2 device code pageOS/2
DCSBitmap graphics (CYMK format)QuarkXPress
DCSDatafileACT! Activity Files
DCTDictionary: used by many programs with program dependent formatClarion
DCTSpell checking dictionaryHarvard Graphics 3.0 - Symphony
DCTDataBaseContainer ExtensionVisual FoxPro
DCUDelphi unit (compiled)Borland Delphi
DCWWalter Machine ProgramingWalter Profile Editor
DCXMulti-page PCX graphics (common fax format)Intel - SpectraFAX
DCXDataBaseContainer IndexVisual FoxPro
DDMacintosh file archiveDISKDOUBLER
DDADataGLBasic ASCII 3D object
DDBBitmap graphics
DDBDigidesign Database FileDigidesign Pro Tools
DDDBuilding DiagramDiagramming software
DDIDisk imageDiskDupe
DDPDevice Driver Profile fileOS/2
DDSDirectDraw Surface fileMicrosoft Flight Simulator, other Microsoft programs
DEBDEBUG scriptDOS Debug
DEFAssembly header fileGeoworks
DEFDefaults - definitions
DEFLinker definition fileTLink - WLink...
DEMDemonstration
DEMDigital Elevation Model
DEMGraphics fileVistaPro
DEMVista DEM fileMeta.exe VP3
DESAscii text parameter descriptionAWAVE
DESKLINKWindows Explorer Desktop Control (commonly "Desktop (create shortcut).DESKLINK", 0 bytes). Uses a 'special' hidden file extension (NeverShowExt flag inside the Registry), overriding the Windows Explorer option of showing/hiding file extensions.
desktopDesktop Entryfreedesktop.org
DEVDevice driver
DEVSYSGEN handler build procedureRT-11
DEVDev-C++ project fileDev-C++
DFDData Flow Diagram graphic fileProsa
DFFRenderWare model data (e.g. Grand Theft Auto III and later)
DFIOutline font descriptionDigifont
DFLDefault program settingsSignature
DFMData Flow Diagram model fileProsa
DFMDelphi form moduleBorland Delphi
DFSDelight Sound File
DFTIDynamic Formatted Text and Images (Word Processing)FlexiWrite
DFVPrinting form (Word)Microsoft Word
DFXMicrografx Effects DLL
DGNGraphics fileMicroStation
DGSDiagnostics
DHDependency information for .phGeoworks
DHPDr. Halo PIC Format graphics fileDr. Halo II - III
DHTDatafileGauss
DID Programming Language interface fileDMD
DIADiagraph graphics fileComputer Support Corporation
DIBDevice Independent Bitmaprarely used Windows 3.0 bitmap; Win - OS/2
DICDictionary (e.g. from WinWord)
DICOMDigital Imaging and Communications in Medicine (DICOM) bitmapDICOM Software (XnView)
DIFBorland patch data fileBorland patch
DIFData Interchange FormatVisicalc
DIFOS/2 V2.2 Display Information FileOS/2
DIFOutput from Diff command - script for Patch command
DIFSRCCOM, BINCOM output fileRT-11
DIGDigilinkAWAVE
DIGSound Designer 1 audio fileAWAVE
DIPGraphics
DIPWatcom debug info processorWatcomDebugger
DIPPCB Drawing fileDipTrace PCB Layout
DIRDialing directory fileProcomm Plus
DIRDirectory fileVAX - CPS Backup
DIRMovieMacroMind Director 4.x
DIRDirectory listing fileRT-11
DISDistribution fileVAX Mail
DISThesaurusCorelDraw
DIZDescription file (Description In Zip)
DJVUDJVU Document Format, a format similar to PDF but with higher compression rates at the same quality.DJVU
DKBRaytraced graphicsDKBTrace
DLAnimation format (Italian origin)Display - DL Viewer
DLD Lotus 1-2-3
DLFDialogue Live FormatProduced by Exstream Dialogue and edited by Dialogue Live Editor
DLGDialog resource script fileMicrosoft Windows SDK
DLGDialog resourcesDN
DLGWindows SDK dialog editor data file
DLGWindows SDK dialog editor data file
DLLDynamic-link libraryWindows 3.x - OS/2
DLLExport/import filterCorelDRAW
DLMMicrosoft File Transfer ManagerMicrosoft File Transfer Manager
DLPDataDAQLab
DLSSetupNorton Disklock
DMFMusic format (Delusion Digital Music File)Delusion
DMFDeleD files
DMGApple Disk ImageMac OS X (Disk Utility),
DMODemoDerive
DMPDump file (e.g. screen or memory)
DMPDUMP utility output fileRT-11
DMSAmiga file archiveDISKMASHER
DNGDigital Negative (DNG), a publicly available archival format for the raw files generated by digital camerasAt least 30 camera models from at least 10 manufacturers, and at least 200 software products
DNTdataRSNetWorx Project
DOJava servlet fileWeb browser (Various)
DOCA Document, or an ASCII text file with text formatting codes in with the text; used by many word processorsMicrosoft Word and others
DOCMMicrosoft Word 2007 Master documentMicrosoft Word 2007
DOCXOffice Open XML Text documentMicrosoft Word
DOFDelphi project options fileBorland Delphi
DOGScreen fileLaughing Dog Screen Maker
DOHDependency information for .pohGeoworks
DORRoland Digital audio fileRoland
DOSExternal command file1st Reader
DOSNetwork driver (e.g. pkt_dis.dos)
DOSOS/2 V3 SVGA PMI-FileSvga.exe
DOSrenamed system files (AUTOEXEC.BAT, COMMAND.COM, CONFIG.SYS,DBLSPACE.BIN, DRVSPACE.BIN, IO.SYS, MSDOS.SYS) of previous MS-DOS versionWindows 95, 98, ME (dual-boot feature)
DOSText file containing DOS specific info
DOTLine-type definition fileCorelDRAW
DOTMicrosoft Word document templateMicrosoft Word
DOTXOffice Open XML Text document templateMicrosoft Word
DOXText fileMultiMate 4.0
DOZDescription Out of ZipVENDINFO
DPCalendar fileDaily Planner
DPData fileDataPhile
DPRDefault project- and state-related informationBorland C++ - Delphi - C
DPFBareboard PCB CAD/CAM formatUcamco
DPXDigital Moving Picture Exchange
DRPWeb3D FileWeb3D
DRSDisplay ResourceWordPerfect for Win
DRVDriver
DRWDesigner vector graphics fileDesigner - MicroGraphix
DSTWAIN Data SourceAny twain-source must supply one xxx.ds file
DS1Map fileDiablo II
DS4Vector graphicsMicrografx Designer 4.x
DSCCelestia Deep Space Catalog fileCelestia
DSCDescription file
DSCDiscard fileOracle
DSDDatabaseDataShaper
DSFData Storage FormatGolden Helix
DSFDelusion Digital Sound FileDelusion
DSKDesktop configurationBP - DN - BC++ - TP
DSKDisk DriversNovell NetWare
DSKLogical disk fileRT-11
DSMDigital Sound ModuleDSI
DSNDesignObject System Designer
DSPDisplay parametersSignature
DSPDynamic Studio Professional ModuleDynamic Studio
DSPGraphics display driverDr. Halo
DSPNorton viewer DLLWin
DSPVisual Studio 6 project fileMicrosoft Visual Studio
DSRDriver ResourceWordPerfect for Win
DSSScreensaver fileDCC
DSSDigital Speech Standard (Sound)Digital Soup
DSSSQL Script for .Time FrameworkExaktime
DSTTajima Embroidery FormatEmbroidermodder
DSTWAIN (Scanner spec) data source DLLWin
DSVNintendo DS battery saveDeSmuME, DraStic
DSWBorland C++ 4.x desktop layout fileBCW.EXE
DSYDAISY container fileADAKTA.EXE
DT1Tile fileDiablo II
DT2msn-emoticonpaint
DT_Data fork of a Macintosh fileMac-ette
DTAData fileTurbo Pascal - PC-File - Stata
DTBDatabase Backup for .Time FrameworkExaktime
DTFDatabase filePFS - Q&A
DTLDjango template languagedjangoproject
DTMDigiTrekker music moduleAWAVE
DTOdataDirectory Toolkit output
DTPDesk Top Publishing DocumentTimeworks / greenstreet Publisher3/ Greenstreet Publisher 4.5
DTPPage Magic 2.0 publicationPage Magic 2.0 upgrades to Greenstreet Publisher
DTPPublicationPublish-It! upgrades to Greenstreet Publisher
DTSTorque Game Engine model format
DVCDataLotus 1-2-3
DVDPROJiDVD project fileiDVD (Apple iLife '08)
DVIDeVice Independent documentTeX
DVPDESQView run-fileDESQView
DVPDevice parameter fileAutoCAD
DW2DrawingDesignCAD for DOS, & DesignCAD for Windows
DWBCoryphaeus Software Designers WorkbenchCSD
DWCArchiveDWC
DWDDiamondWare Digitized fileAWAVE
DWGDrawingAutoCAD, IntelliCAD, PowerCAD, Drafix, etc.
DWZDVD MovieFactory for TOSHIBA Project File, Designer vector graphics fileDesigner - MicroGraphix or TOSHIBA
DXText fileDEC WPS/DX format - DEC WPS Plus
DXFDialogue Exchange FormatExstream Dialogue
DXFDrawing Interchange File Format vector graphicsAutoCAD, IntelliCAD, PowerCAD, etc.
DXNFaxFujitsu dexNET
DXPSpotFire dataTIBCO Spotfire
DXPISO creation project fileCD Burner XP Pro
DYLIBDynamic LibraryMac OS-X
DYNDataLotus 1-2-3
E
EE language source codeE
E##EnCase Evidence File chunkEnCase Forensic Analysis Suite entity
E00ArcInfo interchange fileGIS software
E2D2-dimensional vector graphics fileEditor included in JFire
EASExtended file attributesOS/2
EAREnterprise archivearchive
EBASource codeEmergence BASIC
EBDversions of DOS system files (AUTOEXEC.BAT, COMMAND.COM, CONFIG.SYS, WINBOOT.SYS, etc. ) for an emergency boot diskWindows 98, ME
EBJError-checking object fileGeoworks
EBQCITE standard electronic BQ exchange file
ECError checking preprosessed Goc source codeGeoworks
ECSource codeeC
ECCError-checking filedvdisaster
ECEEscenic Contentng Engine dynamic pageEscenic
ECMSStatus documentECMerge
ECMTTemplate document / SessionECMerge
ED5EDMICSGCGW
EDAEnsoniq ASR disk imageAWAVE
EDEEnsoniq EPS disk imageAWAVE
EDFEuropean data formatMedical timeseries storage files
EDFExchequer Document FormatIRIS Software
EDKEnsoniq KT disk imageAWAVE
EDLEDLPremiere
EDQEnsoniq sq1,2/ks32 disk imageAWAVE
EDSEnsoniq SQ80 disk imageAWAVE
EDTDefault settingsVAX Edt editor
EDTEnsoniq TS disk imageAWAVE
EDTExternal editors definitionsDN
EDVEnsoniq VFX-SD disk imageAWAVE
EEBButton bar for Equation EditorWordPerfect for Win
EFAEnsoniq ASR fileAWAVE
EFAEncrypted File Archive
EFEEnsoniq EPS fileAWAVE
EFEEnsoniq EPS instrument fileAWAVE
EFKEnsoniq KT fileAWAVE
EFQEnsoniq SQ1/SQ2/KS32 fileAWAVE
EFSEnsoniq SQ80 fileAWAVE
EFTEnsoniq TS fileAWAVE
EFTHigh resolution screen fontChiWriter
EFVEnsoniq VFX-SD fileAWAVE
EFXFaxEverex EFax
EGAEGA display fontVentura Publisher
EKAInternal data filesBorland's Eureka
ELELISP source code fileEmacs
ELBSynergy/DE library
ELCbyte Compiled ELISP codeEmacs
ELFO ElsterFormular
ELIArchiveELI
ELTEvent list text fileProsa
EMAILOutlook Express Email MessageWindows Live Mail, Outlook Express, Notepad
EMAKERE language source code (maker)E
EMCStriata Reader Encrypted Document Format
EMDABT Extended MoDuleAWAVE
EMFMicrosoft Enhanced Metafile
EMLStationery TemplateOutlook Express
EMUTerminal emulation dataBITCOM
ENCEncoded file - UUENCODEd fileLotus 1-2-3 - uuexe515.exe
ENCMusicEncore
ENDArrow-head definition fileCorelDRAW
ENFFExtended Neutral File Format
ENGDictionary engineSprint
ENGEnglish documentation
ENGGraphics file (charting)EnerGraphics
ENVEnvelope or Environments
ENVEnveloper macroWOPR
ENVEnvironment fileWordPerfect for Win
EOTEmbedded Open-Type
EPGUI wireframe/prototype projectPrikhi Pencil, Evolus Pencil
EPAAward BIOS splash screenAward BIOS, XnView
EPDPublicationExpress Publisher
EPIDocumentExpress Publisher
EPIEncapsulated PostScript graphic file
EPSEncapsulated PostScript (Graphics format)CorelDraw - PhotoStyler - PMView - Adobe Illustrator - Ventua Publisher
EPUBElectronic Publication - (e-Reader format)Okular (Linux) - Apple iBooks - Sony Reader - Adobe Digital Editions - Calibre (LMW)
EQNEquation filEWordPerfect for Win
ERDEntity Relationship Diagram graphic fileProsa
ERLErlang source code file
ERMEntity Relationship Diagram model fileProsa
ERRCompiler/linker error report
ESCPCBData file of "esCAD pcb", PCB Pattern Layout Design SoftwareesCAD pcb provided by Electro-System
ESCSCHData file of "esCAD sch", Drawing Schematics Diagram SoftwareesCAD sch provided by Electro-System
ESHExtended Shell batch file
ETHDocumentEthnograph 3
ETFEncrypted Text File. Used in some security programs.
ETWProprietary format from EnterTech for the MagicSing/Mic Karaoke product line.Enter-Tech
ETXStructure-enhanced text for some ascii text browsers
EUIEnsoniq EPS family CD imageAWAVE
EVTEvents descriptions
EVTWindows Event log fileMicrosoft Windows NT 4.0 - XP; Microsoft Event Viewer
EVTXWindows Event log file XML structuredMicrosoft Windows Vista, 7, 8; Microsoft Event Viewer
EVYDocumentWordPerfect Envoy
EWDDocumentExpress Publisher for Windows
EX3Device driveRHarvard Graphics 3.0
EXBAudio FileE-MU Systems Emulator X Sampler File
EXCExclude file for Optimize (do not process) (QEMM)QEMM
EXCREXX source code fileVM/CMS
EXEDirectly executable programDOS
EXFExactal Exchange FileCostX
EXFExcute fileOnHand PC
EXMMSDOS executable, system-manager compliant (HP calculator)HP calculator
EXPDrawing File formatDrawing Express
EXPMelco Embroidery FormatEmbroidermodder
EXPProtected mode EXE by PharLap SoftwarePharLap
EXPExports Library FileVisualStudio
EXSAudio FileApple Logic Pro EXS instrument
EXTExtensions descriptions file
EXXIntermediate file by MsgPutIBM LinkWay
EZWeasyOFFER document file[6]easyOFFER by Reagency Systems Corp.
EZFFaxCalculus EZ-Fax
F
FArchiveFREEZE
FForth language source code fileForth development systems
FFortran language source code file (in fixed form)Many Fortran compilers
F01Faxperfectfax
F03Fortran language source code file (in free form)Many Fortran compilers
F2RFarandole Linear ModuleFarandole
F3RFarandole Blocked Linear ModuleFarandole
F4Fortran IV source code file
F4AFlash Video F4V with only audio (see also SWF)Adobe Flash
F4BFlash Video F4V audiobook (see also SWF)Adobe Flash
F4PFlash Video F4V with digital rights management (see also SWF)Adobe Flash
F4VA container format for Flash Video that differs from the older FLV file format (see also SWF)Adobe Flash
F77Fortran language source code file (in fixed form)Many Fortran compilers
F90Fortran language source code file (in free form)Many Fortran compilers
F95Fortran language source code file (in free form)Many Fortran compilers
F96FaxFrecom FAX96
FACsee FACE
FACEUsenix FACE graphics file
FALFalcon script sourceFalcon
FAMFamtasia Famicom image formatFamtasia
FAQFrequently Asked Questions text file
FARMusic format (Farandole Composer Module)Farandole
FASMacsyma compiled program
FAXFax (raster graphics in CCITT format)most Fax programs
FBBackup filesFifth Generation Systems FastBack Plus
FBMFuzzy Bitmap
FBWHP Backup and Recovery ManagerHP Backup
FCSpell checking dictionaryHarvard Graphics 2.0
FCMBinary file patch file (forward compression)jlpak10.zip
FCPFinal Cut Pro project fileFinal Cut Pro
FDDeclaration fileMicrosoft Fortran
FDField offsets for compilerDataFlex
FDFront Door' resource filesFD
FDBFont Definition BlockMing library
FDSfwNES Famicom Disk System imagefwNES
FDSHeaderless Famicom Disk System image
FDWFormF3 Design and Mapping
FDXScreenplayFinal Draft
FEDataSurface Evolver 3D surface
FEBButton bar for Figure EditorWordPerfect for Win
FEIFatal Error InfotableGeoworks
FESFile produced when a fileless occurrence in 3D Topicscape is exported to Windows3D Topicscape
FFIntelligont FIAS format
FFOutline font descriptionAgfa Compugraphics
FFEFront Fareast Famicom image format
FFFFaxdefFax
FFIAtech FastFont (AllType)
FFIVWFile Format for the Interchange of Virtual Worlds
FFTDca/FFT Final Form Text text file (DisplayWrite)
FFTDCA/FFT Final Form Text text fileDisplayWrite
FH3Vector graphicsAldus FreeHand 3.x
FH4Vector graphicsAldus FreeHand 3.x
FIInterface fileMicrosoft Fortran
FIFFractal Image Format file
FIGFigure FileMATLAB
FILTable DataAudit Command Language (ACL)
FILFile templateApplication Generator
FILFilelist
FILFiles list object filedBASE Application Generator
FILMirror. FIL is the name given to the saved FAT by the mirror program included in some versions of DOS and in PCToolsMS-DOS -
FILOverlayWordPerfect
FILFile which was moved to the Virus Vault by AVG
FILEA generic Windows file
FILMFilmkey film fileFilmkey Player
FINPrint-formatted text filePerfect Writer - Scribble - MINCE
FIOAldus PhotoStyler graphics filter
FIOImage PALS viewer DLL
FITFile Index TableWindowsNT
FITsee FITS
FITFityk ScriptFityk
FITSFlexible Image Transport Systemastronomy software
FIXPatch file
FKYMacro fileFoxPro
FLASource material for Flash applications (see SWF)Adobe Flash
FLACAudio codec, Audio file format
FLAMEFractal configuration fileApophysis
FLBFormat libraryPapyrus
FLCAnimation format FLIC >320x200AAPlay - Autodesk AniPro
FLDFolderCharisma
FLIAnimation format FLIC 320x200Autodesk Animator
FLITeX font libraryEmTeX
FLMFilm RollAutoCAD/AutoShade
FLPFlstudio project fileFruity Loops (FlStudio)
FLPFLP Designer layout fileFLP Designer
FLTData/file conversion filter (or overlay)Alsud, Microsoft Word
FLTFilter fileMicrografx Picture Publisher
FLTMultiGen Flight
FLTSupport file - graphics filterAsymetrix ToolBook
FLXAnimation format
FLXCompiled binaryDataFlex
FLVA container format for Flash Video (see also SWF)Adobe Flash
FMDatabaseFileMaker Pro
FM1Spreadsheet format overlayLotus 1-2-3 release 2.x
FM3Device driverHarvard Graphics 3.0
FM3SpreadsheetLotus 1-2-3 release 3.x
FMBFile Manager Button barWordPerfect for Win
FMFFont or icon fileIBM LinkWay
FMKMakefileFortran PowerStation
FMOCompiled format filedBASE IV
FMTFormat filedBASE IV - FoxPro - Clipper 5 - dBFast
FMTGate3 format file
FMTStyle sheetSprint
FMVFull Motion Video file
FN3Font fileHarvard Graphics 3.0
FNDFiles searching propertiesWin95
FNIFileNet Native DocumentFileNet
FNKFunkTracker music moduleAWAVE, FunkTracker
FNMFannie Mae Residential Loan Data (RLD) format for mortgage submission to DO/DUDesktop Originator
FnnDOS screen text font - height nn pixelsfntcol13.zip
FNTFont filemany
FNXInactive fontExact
FO1Font fileBorland Turbo C
FO2Font fileBorland Turbo C
FOGFontographer Database FileFontographer3.5
FOLFolder of saved messages1st Reader
FONLog of all callsProcomm Plus
FONTerminate phonebookTerminate - Terminator - Telix
FONWindows bitmapped font fileWin
FONTFont dataunix
FOPFreedom of the Press graphic file
FORFormWindowBase
FORFortran language source filemany
FOTInstalled Truetype fontWindows Font Installer
FOXFoxbase executable (precompiled .prg)FoxBase
FPFinal Page fileFoxPro for DOS
FPTiff fileTIFF/IT P1
FPVideo fileDVICO/TVIX MPEG1 video file
FP3DatabaseFileMaker Pro
FP4DatabaseFileMaker Pro
FP5DatabaseFileMaker Pro
FP7DatabaseFileMaker Pro
FPCCatalogFoxPro
FPDTMT Pascal compiled unitTMT Pascal
FPMConfiguration fileFoxPro for MacIntosh
FPTFoxpro memo field tablesFoxPro
FPUConfiguration fileFoxPro for Unix
FPWFloorplan drawingFloorPLAN plus for Windows
FPWConfiguration fileVisual FoxPro
FPXFlashPix Bitmap Image FileFlashPix
FR?Packed mailFTN software
FR3Renamed dBASE III+ form filedBASE IV
FRFFontMonger Database fileFontMonger
FRGUncompiled report filedBASE IV
FRLGP-Forth libraryGP-Forth
FRMRegistration or other form
FRMReport filedBASE IV - Clipper 5 - dBFast
FRMVisual Basic FormVisual Basic
FROCompiled report filedBASE IV
FRPFormPerForm PRO Plus - FormFlow
FRSScreen Font ResourceWordPerfect for Win
FRTAdditional (FPT) report description fileFoxPro
FRTGP-Forth source fileGP-Forth
FRXMain (DBF) report description fileVisual FoxPro
FRXVisual Basic binary program fileVisual Basic
FSAApplied Biosystems Genetic Analysis data fileGeneScan
FSIMSimulation File FormatLoudsoft
FSLFormParadox for Windows
FSMFarandole Composer WaveSampleFarandole
FSPROJHabanero Firestarter projectHabanero Firestarter
FSTLinkable programdBFast
FSTTemporal database fileGTKWave data file
FSTICKTemporal database fileFlash Joystick
FSXDataLotus 1-2-3
FTDFalcon dynamic templateFalcon
FTMFont fileMicrografx
FTSFull text search index of old Windows Help fileWindows 3.0 - XP
FTXTtextCloanto text document
FTPConfigurationFTP Software PC/TCP
FUKMap FilePostal 2
FWDatabaseFrameWork
FW2DatabaseFramework II
FW3DatabaseFramework III
FWEBFortran WEB
FXOn-line guideFastLynx
FXDPhonebookFAXit
FXPFoxpro executable (precompiled .prg)Visual FoxPro
FXSFAX Transmit Format graphics fileWinFax
FYFFileLocFyTek, Inc.
G
GData chartAPPLAUSE
G16GoldED for DOS compiled configGOLDED.EXE
G3Group 3 FaxNetpbm,ImageMagick,XnView
G3DGlest model fileG3D viewer
G3PdataGrand Prix 3 car physicsGrand Pix 3
G8Raw graphics file (one byte per pixel) plane threePicLab - Cubicomb Picturemaker
GAFGloba Game Engine audio formatGloba Game Engine
GAMFaxGammaFax
GAMEPROJGamesalad game project formatGameSalad
GBGame Boy ROMNintendo
GB1Game Maker backup file (can also be GB2, GB3, etc.)
GBAGame Boy Advance ROMNintendo
GBCGame Boy Color ROMNintendo
GBLGenesis Bitmap LayoutGenesis Bitmap
GBLGlobal definitionsVAXTPU editor
GBLGlobal module in Basic programsBasic
GBPGenesis Bitmap PatternGenesis Bitmap
GBSGBS meta dataGeneric Build Support (GBS)
GBRGerber formatPCB CAD/CAM
GBRGIMP brush
GCSavegameStar Wars: Battlefront II Galactic Conquest save file
GC1Lisp source codeGolden Common Lisp 1.1
GC3Lisp source codeGolden Common Lisp 1.3
GCAIBM GOCAGCGW
GCDGraphicsROBLOX
GCDGeneral content descriptorWireless devices
GCDGeneric Cadd drawingGeneric Cadd, Visual Cadd
GCFGame cache fileSteam content delivery system
GCHGNU preprocessed C++ header fileGNU C++ compiler
GCINintendo GameCube save fileNintendo GameCube
GCXGraph fileMac OS X Grapher
GD3Game Doctor Super NES ROM image
GDFGeneral Data Format for Biomedical SignalsBiomedical signal processing, Brain Computer Interfaces
GDFDictionary fileGEOS
GDFGeographical Data FormatVarious mapping software
GDFIBM Graphics Data FormatLegacy IBM systems
GDLDataArchiCAD model
GDSMcDonnell-Douglas Things
GDTGerätedatentransfer, an xDT applicationHealthcare providers in Germany
GEGEcho config fileGEcho
GEDGEDCOMGenealogy data exchange
GEDNative format for all A&L products since 1983Arts & Letters
GEDGoldED for DOS compiled config fileGOLDED.EXE
GEDGraphics editor fileEnerGraphics
GEDGame Editor Data / project fileGame Editor
GEMVector graphics fileGEM - Ventura Publisher
GENCompiled templatedBASE Application Generator
GENGenerated textVentura Publisher
GEOGeodeGeoworks
GEOGEOS specific file (application)GEOS
GEOGoldED for OS/2 compiled config fileGED2.EXE
GEXGEcho config fileGEcho
GFBCompressed GIF image created by GIFBLASTgifblast.exe
GFOSGI Radiosity
GFTFontNeoPaint
GFTGEM-translator font file
GFXInstant Artist graphics FilesInstant Artist
GFXPCBoard @X-coded colorful textGFX2COM - GFX2EXE
GHONorton Ghost File (first file)Symantec
GHSNorton Ghost File (split file)Symantec
GHWGHDL Wave fileGHDL/GTKWave data file
GIBChartGraph-in-the-Box
GIBGIMP animated brush
GIDGlobal index of old Windows Help fileWindows 3.0 - XP
GIFCompuserves' Graphics Interchange Format (bitmapped graphics)QPeg - Display - CompuShow
GIWPresentationGraph-in-the-Box for Windows
GKHEnsoniq Disk Image (VFX, SD, EPS, ASR, TS)Ensoniq
GKSGraphics Kernel System
GLAnimation formatgrasprt.exe, PV
GLAnimationGRASP GRAphical System for Presentation
GLBGlobal module in Basic programs
GLMDatafile, KernelCAD modelGlim, KernelCAD
GLOGlobal module in Basic programs
GLSDatafileAcross
GLYWinword GlossaryMicrosoft Word
GM6GameMaker Editable file as of version 6.xGame Maker
GM81GameMaker Editable file as of version 8.1.xGame Maker
GMDGameMaker Editable file up to version 5.xGame Maker
GMFCGM graphics fileAPPLAUSE
GMKGameMaker Editable file as of version 7.x or 8.xGame Maker
GMLGameMaker GML script fileGame Maker
GMLGeography Markup Language FileGeography Markup Language
GMODDataGolgotha 3D model
GMPGeomorph tile mapSPX
GMSGhost Mouse Script
GMSGesture and Motion File Formats
GMTGene Matrix Transposed
GMTdataRFactor car physics
GMXGameMaker:Studio Editable File as of 1.xGame Maker
GOGo source code fileGolang
GOCGoc source code fileGeoworks
GOEGOES graphic file
GOHGoc header fileGeoworks
GPGeode parameter fileGeoworks Glue
GP4dataGrand Prix 4 car physics
GP5Guitar Pro 5 songGuitar Pro 5
GPHGraphLotus 1-2-3/G
GPKOmnigo program package
GPXGPS eXchange Format
GR2Screen driverWindows 3.x
GRADatafileSigmaPlot
GrADSMetafile
GRAFFLEOmniGraffle graph file
GRASPGraphical System for Presentation
GRBT-FLEX CAD fileTop Systems
GRBMS-DOS Shell Monitor fileMS-DOS 5
GRDDrivers for GRX (graphics library)GRX (c) Free Soft. Found.
GRDNTImage format used in the core of some very obscure customized operating systems to represent gradients; see also SCTOR
GREdataGrenoble Thermal ellipsoids Plot Program
GRFGraph fileGraph Plus, DPlot, and Charisma
GRFTGraph definition text fileSELDM Postprocessor
GRIBGridded Binary
GRNDrivers for GRX (graphics library)GRX (c) Free Soft. Found.
GRPGroup fileWindows 3.x - Papyrus
GRPPictures groupPixBase
GRYGraphics format (RAW GREYz)
GSScript written in Google Apps Script, used for automating tasks across online Google productsGoogle Apps Script
GS1PresentationGraphShow
GS3dataGameStarter
GSAdataMicrosoft Office Groove Space Archive
GSDVector graphicsProfessional Draw
GSMRaw GSM 6.10 audio streamAWAVE
GSPGeometer's Sketchpad
GSWWorksheetGraphShow
GTAdataMicrosoft Office Groove Tool Archive
GUP PopMail
GVGrandView outline file
GVODataGFXFX Vector Object
GWIGroupwise FileLocal saved Email
GXLGraphics libraryGenus
GXKSecure Data encryption FormatGalaxkey
GZArchiveGNU zip - WinZipNT
GZRdataGunZ action replay
H
H!On-line help fileFlambeaux Help! Display Engine
H!Pertext databaseHELP.EXE
H--C—language headerSphinx C--
HHeader file (usually C language)Watcom C/C++
H++Header fileC++
HAArchiveHA
HALData fileHyper Access Lite OS/2
HAMDisk Drivers NPANovell NetWare
HAMHold And ModifyDeluxe Paint image file
HAPArchiveHAP3
HBCCompressed Archive File (Shrink Algorithm)Hyperbac
HBCCompressed Archive File (Shrink Fast Algorithm)Hyperbac
HBECompressed, Encrypted Archive File (Shrink & AES256-bit Encryption)Hyperbac
HBKMathCAD handbookMathCAD
HCHeader file
HCGDocumentHCLab
HCGSDocumentHCLab
HDDdatadisk image
HDDHotDisc Designer label
HDFAmiga Hard Disk Image
HDFHelp fileHelp Development Kit
HDFHierarchical Data File graphics fileSDSC Image Tools
HDLAlternate download file listingProcomm Plus
HDMPheap dumpfile
HDRDatafileEgret
HDRMessage header textProcomm Plus - 1st Reader
HDRPC-File+ Database header
HDRSPOT image file
HDSHierarchical Data System
HDWVector graphicsHarvard Draw
HDXHelp indexAutoCAD - Zortech C++
HDZAmiga Zip compressed Hard Disk Image
HEPNovell Help Librarian Data FileNovell NetWare
HEXHex dump
HFIHP Font Info fileGEM
HGLHighlight groups definitionsDN
HGLHP Graphics Language graphics file
HHC++ header file
HHHPrecompiled header filePower C
HHPHelp information for remote usersProcomm Plus
HIGame high scores table
HINMoleculeHyperChem
HISHistory of executing/viewing/editingDN
HISYard Information FileFYM
HKMStores sound in a bitmapped graphics file
HLBHelp libraryVAX
HLPold Windows Help fileWindows 3.0 - XP, Help Explorer Viewer
HLXMulti Edit help fileMultiEdit 5.0
HLZMulti Edit packed help fileMultiEdit
HMIMusic format (MIDI)
HMMAlternate Mail Read option menuProcomm Plus
HMPMusic format (MIDI)
HMPHump Setup File - Obsolete as of version 2.4 (See SET and SWT files)FYM
HNCCNC program files Heidenhain (?) dialog
HOFHall Of Fame (game scores)
HOMCAD Software Data FilePLXHOME
HPPrintout file for HP printers/plotters (HP/GL)
HP8ASCII text HP Roman8 character setNewWave Write
HPFHP LaserJet fontsPageMaker
HPGsee HPGL
HPGLPlotter file vector graphics (Hewlett-Packard Graphics Language)AutoCad - Harvard Graphics
HPIFont information fileGEM
HPJHelp projectMicrosoft Help Compiler for Windows - HC.EXE
HPKArchiveHPACK
HPMAlternate Main menu for privileged usersProcomm Plus
HPMEMM textHP NewWave
HPMHigh Performance MapQuaestor 1.x
HPPC++ header fileZortech C++ - Watcom C/C++
HPPCLHewlett-Packard Printer Control Language
HQXArchive (ASCII Mac)BINHEX
HRFGraphics file (Hitachi Raster Format)
HRMAlternate Main menu for limited/normal usersProcomm Plus
HRZGraphics formatSSTV
HS2Monochrome imagePostering
HSC2-op FM musicHSC tracker - hscplay.exe
HSHDisk image hash fileDriveSnapshot
HSIHandmade Software Inc. graphics file almost JPEGImage Alchemy
HSTHistory fileProcomm Plus
HTMsee HTML
HTMLHypertext Markup Language (WWW)Netscape - Mosaic - many
HTXHypertext file
HUSHusqvarna Viking Embroidery FormatEmbroidermodder
HVEHive file[1]Microsoft
HWAHollywood appletHollywood
HWDPresentationHollywood Designer
HWPHangul Word Processor DocumentHangul (word processor)
HWSHollywood scriptHollywood
HXMAlternate Protocol Selection menu for all usersProcomm Plus
HXSMicrosoft Help 2 compiled help fileMicrosoft Windows, Help Explorer Viewer
HXXC++ header file
HY1Hyphenation algorithmsVentura Publisher
HY2Hyphenation algorithmsVentura Publisher
HYCDataWordPerfect
HYDHyphenation dictionaryWordPerfect for Win
HYPArchiveHYPER
I
IPreprocessor output fileBorland C Preprocessor
ISWIG interface fileSWIG
IAKInternet Access KitOS/2
IAMAssembly fileAutodesk Inventor
IAXBitmap graphics (IBM Image Access eXecutive)
IAXdataInstallAnywhere.NET project
IBGPDS graphic file
IBMArchive (Internal IBM only)ARCHDOS
IBRORobot save fileIncredibots 2
ICABitmap graphics (Image Object Content Architecture)
ICBTarga ICB bitmap graphicsmany raster graphics editors
ICCICC configuration
ICELHA ArchiveCracked LHA (old LHA), Total Commander
ICFEIceFormula Equation WorkspacePenguin George
ICFMIceFormula Math WorkspacePenguin George
ICMICC configuration
ICNICON source code file
ICOIcon fileICONEDIT.EXE; Microsoft Windows
IDDisk identification file
IDBIDA databaseIDA
IDBVC++ Minimum Rebuild Dependency FileVisual C++
IDCIDA C language sourceIDA
IDEBorland C++ 4.x IDE projectBCW.EXE
IDFMIDI instrument description
IDSIDA imported names formatIDA
IDWVector graphicsIntelliDraw
IDWDrawing fileAutodesk Inventor
IDXIndexmany - FoxPro; also unrelated Quicken file format
IFDFormJetForm Design
IFFInterchange Format File (IFF)EA Software - Convert (C) Villena - Amiga
IFFSun TAAC Image File FormatSDSC Image Tool
IFPScriptKnowledgeMan
IFSFractal image compressed fileYuvpak
IFSIterated fractal system fileIFS Creation Kit, Apophysis
IFSInstallable file systemOS/2
IGESInitial Graphics Exchange Specification
IGFInset SystemsGCGW
IGCFlight tracks downloaded from GPS devices in the International Gliding Commission's prescribed format
IHPWatcom help filewhelp.exe
IHSInbound HistoryBink/+
IIWPower Point Image Importer Wizard
ILhDC Designer Icon Lin dll format
ILBDataScream Tracker
ILGdataLaTeX Index Generation log
ILKOutline of program's formatMicrosoft ILink incremental linker
IMAuran Jet indexed mesh fileTrainz
IM8Sun Raster graphics file
IMAMirage vector graphicsEGO - Chart - Autumn
IMADisk imageWinImage
IMGADEX graphic file
IMGDisk ImageNC 5.0
IMGGEM bitmapped graphics fileVentura
IMGImage for Windows/Image for DOS Disk imageTeraByte, Inc. dba TeraByte Unlimited
IMGVivid IMG file
IMIimageMagellan Meridian map
IMIimageMagellan eXplorist map
IMPSpreadsheetLotus Improv
IMQImage presentationImageQ
IMZDisk imageWinImage
INDesign II for Windows INput file
INautoconf INput file
IN$Installation fileHP NewWave
IN3Input device driverHarvard Graphics 3.0
INBTest scriptVermont HighTest
INCInclude fileseveral programming languages
INDData IndexdBASE IV
INDDInDesign DocumentAdobe InDesign
INFInformation text file (ASCII)
INFInstall script
INFOS/2 hypertext help system fileVIEW.EXE
INFType 1 LaserJet font information filesoft font installers
INFOGNU info reader (output from Texinfo)info (Unix)
INFOIcon Data (Amiga)
INGRIntergraph Raster File Format
INIInitialization file
INKPantone reference fills fileCorelDRAW
INSDataWordPerfect
INSEnsoniq Instrument FileEnsoniq
INSInstallation script1st Reader
INSInstrument music file (Adlib)
INTBorland Interface Units
INTProgram saved in Internal (semi-compiled) formatSignature
INTSource of Borland interface module
INXIndexFoxbase
IOArchiveCPIO
IOB3d graphics database in TDDD formatImagine
IOCOrganizational chartInstant ORGcharting!
ION4DOS DESCRIPT.ION file (file descriptions like long filenames, comments, or extended attributes)4DOS, NDOS, 4OS2, 4NT, TC, TCC, VC, DN, ODN, NDN, Windows Commander, Total Commander, XnView, ACDSee, Newsbin Pro, V, as well as some CUI LIB-based applications
IPImmortal Player fileImmortal Player
IPAApple iOS ApplicationiPhone, iPod touch, iPad
IPCIntellitec Program Configuration - used to configure vehicle electronicsIntellitec
IPFInterchangeable Preservation FormatSoftPres
IPGiPod game fileiTunes and iPod
IPHHi-Res ImageInterPaint
IPLPantone Spot reference palette fileCorelDRAW
IPNIntecplan projectIntecplan Business Plan Software
IPSIPS Patching Format (International Patching System)[citation needed]Rom hacking community
IPSWiOS firmware fileiPhone, iPod touch, iPad, Apple TV
IPTPart fileAutodesk Inventor
IPTMultiColor ImageInterPaint
IRRMESHstatic irrMesh files
IRSResource (WordPerfect) standard.irsWordPerfect
IRTDataIRIT 3D model
IRTRGraphicon-2000 Interactive Real-Time PHIGS
ISDSpelling Checker dictionaryRapidFile
ISHArchiveISH
ISMAOutput Video fileIslam Abusa'a Software
ISOISO-9660 tablesee: List of ISO image software
ISTDigitrakker Instrument FileAWAVE
ITImpulse Tracker music fileImpulse Tracker
ITSettingsintalk
ITFTechnical indicator, trading system or market scan source code fileProRealTime
ITFInterface fileJPI TopSpeed Pascal
ITLiTunes music library
ITNItinerary fileTomTom PNDs
ITTIconTweaker Theme
IVSGI Inventor
IV-VRMLInventor VRML Format
IVEOpenSceneGraph 3D model
IVIImage fileImmerVision
IVLLensflare fileImmerVision
IVPPanorama fileImmerVision
IVUUser Interface fileImmerVision
IWPresentation flowchartIconAuthor - HSC InterActive
IWAText fileIBM Writing Assistant
IWBInformation WorkBenchProdeo
IWDCall of Duty Map - Game Data ArchiveActivision, Inc.
IWPText fileWang
IXdatadtSearch index
IZTIzl binary token fileIZL
J
J2CJPEG 2000 image
JAMJam messagebaseFTN software
JAMJam music scoreJam
JARJava archiveJAR, Java Games and Applications
JASsee JASC
JASCGraphics format (JASC)
JAVsee JAVA
JAVAJava source code file
JBDDatafileSigmaScan
JBIGJoint Bilevel Image Group
JBXProject fileProject Scheduler 4
JCNJobClock.Net Synch File
JEFJanome Embroidery FormatEmbroidermodder
JETFaxHybrid JetFax
JFFsee JFIF
JFIFJPEG File Interchange Format
JIFsee JFIF
JMSMusic format (JMusic file)UltraForce
JNLPJava Network Launching ProtocolJava Web Start
JOBGravostyle engraving pattern fileGravostyle/Gravograph
JOBQUEUE output fileRT-11
JORJournal file SQL
JOUJournal backupVAX Edt editor
JP2JPEG 2000 image
JPCGraphicsJapan PIC
JPEGJoint Photographic Experts Group graphics file formatQPeg - FullView - Display
JPGJoint Photographic Group
JPSbackup of startup files (AUTOEXEC.BAT, CONFIG.SYS, 4DOS.INI) by installation of 4DOS (JP Software)4DOS
JREJava Runtime EnvironmentJava
JRNJMP journalJMP
JSJavaScript filescript in HTML pages
JSONJSON (JavaScript Object Notation)Ajax
JSONLDJSON-LD, a JSON-based Serialization for Linked Data
JSPJavaServer PagesDynamic pages running Web servers using Java technology
JTFFaxHayes JT Fax
JTFGraphics (TIFF file with JPEG compression)
JVXDataJavaView object
JWText documentJustWrite
JWLLibraryJustWrite
JZZSpreadsheetJazz
K
K2ADataPrince of Persia 3D object
K3DDescription of macro language 3DS3DS
KAPMap Info Sea Chart
KARMusic format (Karaoke)ITune 1000.Corp
KARPrecompiled .prg for KARATRus. FOX+ 2.0
KBKeyboard scriptBorland C++ 4.5
KBProgram sourceKnowledge Pro
KBK-Brief in XML formatTCC's Set-Based Thinking™ Tools
KBAK-Brief AttachmentTCC's Set-Based Thinking™ Tools
KBASICSourceKBasic
KBDKeyboard mappingLocoScript - Signature - Procomm Plus
KBMKeyboard mappingReflection 4.0
KBSK-Brief in Encrypted formatTCC's Set-Based Thinking™ Tools
KBZK-Brief in Compressed formatTCC's Set-Based Thinking™ Tools
KCLLisp source codeKyoto Common Lisp
KDKoara DocumentKoara
KDBKeePass 1.x database fileKeePass
KDBXKeePass 2.x database fileKeePass
KDCKodak Digital Camera (graphics)PhotoEnhancer by PictureWorks
KEP(unknown)(unknown)
KEXKedit Macro FileKedit
KEYDatafileForecast Pro
KEYKeynote presentation fileKeynote (Apple iWork '08)
KEYKeyboard macros
KEYOS/2 archive .key-file (i.e. OS2.KEY)OS/2
KEYSecurity file e.g. Shareware Registration info
KEYKeynoteiOS devices, Macintosh
KFNcomplex music format|[2]Karafun Karaoke(R)
KFXKofax GroupGCGW
KITPower Chords drum kit filePower Chord
KMCKatzReview's MegaCrammer
KMLKedit Macro LibraryKedit
KMLKeyhole Markup LanguageGoogle Earth
KMYdataKMyMoney
KMZKeyhole Markup Language (Zip compressed)Google Earth
KnnDatabase key fileClarion
KNOPersonal Knowbase data filePersonal Knowbase
KOlinux kernel object filelinux kernel
KODUKodu game save fileKodu Game Lab
KPLsource codePhrogram
KPPToolpadSmartPad
KPSIBM KIPS bitmap graphics
KR1Kurzweil 2000 sample fileAWAVE
KR2Kurzweil 2000 sample fileAWAVE
KRZKurzweil K2000 FileKurzweil
KSSource codeKonsolScript Document
KS3Data3D Forgastest Editor object
KSMPfaff Embroidery FormatEmbroidermodder
KTUKnow The Unknown Online Service PacksUnknownsoft
KWBKnowledge WorkBenchProdeo
KYBKeyboard mappingFTP Software PC/TCP
L
LLEX source code file
LLinker directive fileWATCOM wlink
LLISP source code file
LA0DatafileSCUMM index file
LABDatafileNCSS - SOLO
LABMailing labelsQ+E for Microsoft Excel
LANErdas image file
LANLAN DriversNovell NetWare
LANGLanguage fileMinecraft, Skype
LASLasso FileLasso Programming Language File
LASSOLasso FileLasso Programming Language File
LAYWord chart layoutAPPLAUSE
LBGLabel generator datadBASE IV
LBLLabeldBASE IV - Clipper 5 - dBFast
LBMGraphics format (Amiga)Pic-view - Deluxe Paint
LBMLinear bitmap graphicsXLib
LBOCompiled labeldBASE IV
LBR.LBR Archivefor CP/M and MS-DOS using the LU program
LBRDisplay driverLotus 1-2-3
LBTAdditional (FPT) label description fileFoxPro
LBXMain (DBF) label description fileFoxPro
LCFLinker Control FileNorton Guides compiler
LCHChartIBM Works for OS/2
LCKLockfileParadox
LCLData (FTP Software PC/TCP)
LCLDataFTP Software PC/TCP
LCNLectionWordPerfect
LCSDatafileACT! History Files
LCWSpreadsheetLucid 3-D
LDLong Distance codes fileTelix
LDAAbsolute binary file (load image)PDP-11, RT-11
LD1Overlay filedBASE
LDBData filer databaseIBM Works for OS/2
LDBOverlay fileMicrosoft Access
LDFData filer formIBM Works for OS/2
LDFLibrary definition fileGeoworks Glue
LDTLabordatenträger, an xDT applicationHealthcare providers in Germany
LEDOS/4GW executable imageDOS/4GW PM 32X DOS Extender
LESLesson (check *.cbt)
LEVLevel fileNetHack 3.x
LEXDictionaryMicrosoft Word - Lexicon
LFLLucasArts resource file
LFDLucasArts resource fileLucasArts games
LFTLaser printer fontChiWriter
LGLogo procedure definitionsLSRHS Logo
LGOLogo for header and footerSuperFax
LGOStartup logo codeWindows 3.x
LHALHA ArchiveLHA/LHARC, Total Commander
LHWAmiga archiveLHWARP
LIBLibrary fileseveral programming languages
LICLicense file used by some programs to put their license on disk
LIFArchive
LIFCA Clipper packed fileCA Clipper installer
LIFLogical Interchange Format data fileHewlett-Packard
LIMArchiveLIMIT
LINLine typesAutoCAD
LISListingVAX
LITMicrosoft E-book fileMicrosoft Reader
LITWeb3D FileWeb3D
LIXLog file (history)Audit Command Language (ACL)
LJText file for HP LJ II printer
LLLLVM Assembly Languagellvm
LL3LapLink III related file (document)LapLink III
LMAuran Jet LOD mesh table (text file to control LODs)Trainz
LMPDoom lump (data file, commonly "demo" recordings)Doom - Doom2
LNGLanguage definition file
LNKLinker response file.RTLink
LNKLinker script
LNKWindows 95 shortcutWindows 95
LNKWindows XP shortcutWindows XP
LODLoad file
LOGLog fileNumerous systems
LOM3D ModelLock On: Modern Air Combat
LPCPrinter driverTEKO
LRCLyrics data
LRFLinker response fileMicrosoft C/C++
LRFUnencrypted BroadBand eBook fileSony Librie eBook reader
LRPReportIBM Works for OS/2
LRSLanguage Resource FileWordPerfect for Win
LRXEncrypted BroadBand eBook fileSony Librie eBook reader
LSLiveScript source code file
LSALightscape Technologies ASCII
LSBLightscape Technologies Binary
LSCLeostream Connect fileLeostream Corporation
LSPLISP source code fileXlisp, AutoLISP
LSSSpreadsheetLegato - IBM Works for OS/2
LSSSYSLINUX Splash Screen GraphicSYSLINUX, XnView
LSTAus. BOM Hourly weather Data
LSTFilelistFRQView
LSTKeyboard macro1st Reader
LSTList file (archive index - compiler listfile)
LSTListing (e.g. source code)
LSTMap listHolux - Alan
LSTSpool fileOracle
LSTSLP output fileRT-11
LTADataLithTech ASCII 3D object
LTMForm (Lotus Forms)Lotus
LUALua script fileMicrosoft Visual C++, Notepad++
LUWlabel data fileLabels Unlimited for Windows
LUX2D and 3D graphics data fileFoliomap and Spectramap
LUZ3D graphics data fileSpectramap CUDA
LWDText documentLotusWorks
LWOLightwave Object Format
LWPWord processorIBM Works for OS/2, Lotus Wordpro
LXFLego Exchange FormatLego Digital Designer data file
LXOLuxology scenemodo3D software
LXTTemporal database fileGTKWave data file
LYLilyPond Notation FileLilyPond
LYRLyrics (ASCII)
LYTDocument Layout fileAdminsoft Accounts
LZArchiveLzip
LZDDifference file for binariesLDiff 1.20
LZHLHA ArchiveLHA/LHARC, Total Commander
LZSLHA ArchiveLARC, Total Commander
LZWArchiveLHWARP
LZXAmiga ArchiveLZX
M
MMathematica Package FileMathematica
MMATLAB M-FileMATLAB
MMercury Source FileMercury
MSource codeObjective-C
M2WoW Model Object fileBlizzard Entertainment games (World of Warcraft/Warcraft series)
M2TSMPEG 2 Transport StreamVarious media playback devices / software
M3UM3U playlist fileWinamp, XMMS
M3U8Unicode version of M3U playlist file (UTF-8)Winamp, XMMS
M4m4 macro file
M4AAdvanced Audio Coding
M4riPhone ringtoneiTunes and iOS devices
M7PMultilizer 2007 and 2009 localization project fileMultilizer
M8M8MAM8 Model File
MAFFMozilla Archive FormatMozilla Firefox (with add-on)
MAIMailVAX
MAKMakefile
MAKProject fileVB – VC ++
MANUser guide (manual)
MANAGERAccounting data fileManager – free accounting software
MAPColor palette file
MAPFormat dataMicrografx Picture Publisher
MAPLinker map file
MAPMap file (usually created by compilers)
MAPMapAtlas MapMaker
MAPNetwork mapAccView
MAPGame map for Duke Nukem 3D
MARAssembly programVAX Macro
MARMicrosoft ARchiveMSN Explorer (possibly other Microsoft products too)
MARMozilla ARchiveMozilla Updater (used to house binary updates to products)
MASSmartMaster setFreelance Graphics
MATDataMATLAB
MATMicrosoft Access TableMicrosoft Access
MAXMAX source code file
MAXPfaff Embroidery FormatEmbroidermodder
MBMemo field values for databaseParadox
MBKMultiple index file backupdBASE IV
MBPMetadata.mobi (Mobipocket)
MBRMaster Boot Record FileGRUB
MBXMailbox dataEudora/ZERBERUS
MCAMinecraft "Anvil" world formatMinecraft 1.2 and onward
MCCConfiguration fileMathcad
MCDMathCad fileMathCad
MCFFont fileMathcad
MCFPhoto book or photo calendar layout fileFotoInsight Designer
MCFMultimedia Container Format (predecessor of Matroska)
MCIMCI command scriptMedia Control Interface
MCLMulti Edit macro libraryMulti Edit
MCLCartesian manipulator for laser systems
MCPApplication scriptCapsule
MCPPrinter driverMathcad
MCRMinecraft saved world "region" fileMinecraft (up to 1.1)
MCWText fileMacWrite II
MDArchivemdcd10.arc
MDText file found on github on many project readme.pmMark Down
MD2Quake 2 Model Fileid Software
MD3Quake 3 Model Fileid Software
MD5Doom 3 and Quake 4 Model Fileid Software
MD5MD5 checksummd5sum,Total Commander
MDADataMicrosoft Access
MDAMicrosoft Access system databaseMicrosoft Access
MDBMicrosoft DataBaseMicrosoft Access
MDFMedia Descriptor File, binary files in which the actual disc (CD/DVD) data is storedAlcohol 120%
MDFMaster Data File, a Microsoft SQL Server file typeMicrosoft SQL Server
MDFMeasurement Data Format, a binary file format for vector measurement dataautomotive industry, developed by Robert Bosch GmbH
MDLModel3D Design Plus or Simulink
MDLSpreadsheetCA-Compete!
MDLGoldSrc Model File (Quake-Based Engine)Valve Corporation
MDLSource Engine Model FileValve Corporation
MDLQuake 1 Model Fileid Software
MDLNintendo GameCube Luigi's Mansion ModelNintendo
MDMModem definition fileTELIX
MDMPMini dumpfile
MDRMicrodrive fileZX Spectrum emulator by g.a.lunter
MDSMidi SessionSound Imp.
MDTData tableMicrosoft ILink incremental linker
MDXMultiple index filedBASE IV
MDZText description of music moduleCubic Player – Cross-View
MEMultiEdit configurationMultiEdit
METext file READ.ME
MEBMacro Editor bottom overflow fileWordPerfect Library
MECMECCA sourceMaximus
MEDMacro Editor delete saveWordPerfect Library
MEDMusic formatMED/OctaMED
MediawikiWiki markupmost wikis
MEMMacro Editor macroWordPerfect Library
MEMMemory variable save filedBASE IV – FoxPro – Clipper
MEMMemos datafileClarion
MEMMnemosyne databaseMnemosyne; other spaced repetition software
MEQMacro Editor print queue fileWordPerfect Library
MERMacro Editor resident area (vakioalue)WordPerfect Library
MESMacro Editor work space fileWordPerfect Library
MESMessage
METDocumentOmnipage Pro
METMacro Editor top overflow fileWordPerfect Library
METOS/2 graphics metafilePICVIEW.EXE
MEUMenu groupDOS Shell
MEXMacro Editor expound fileWordPerfect Library
MEXMEX file (executable command)Matlab
MFMetafont fileTeX
MFASource code fileMultimedia Fusion 2 / The Games Factory 2
MFFMIDICakewalk, MTPro 4
MFMMusic formatDMP
MGFFontMicrografx
MGFMaterials and Geometry Format
MGXDesigner 4.1 DrawingDesigner 4.1
MHTWeb Archive Single File
MIBSnmp MIB file
MIDStandard MIDI filemusic synthetizers, Winamp
MIDISee MID
MIFFMagick Image File Format
MIIDatafileMicroStat-II
MIMEMessage in MIME format (RFC822)
miniUSFNintendo proprietary MIDI file format for the Reality Signal Processor (Nintendo 64)Nintendo 64 games
MIOMyInfo topicMilenix MyInfo
MISMission, used by many games
MITMitsubishi Embroidery FormatEmbroidermodder
MIXObject filePower C
MKMakefile
MKEMakefileMicrosoft Windows SDK
MKGMakefile
MKIGraphics format (Japan MKI)
MKIJapanese graphics MAKIchan formatMagView 0.5
MKSDataTACT
MKVMatroska Multimedia ContainerMedia Player Classic, Windows Media Player, Matroska Splitter
ML3ProjectMilestones 3.x
MLBMacro library fileRT-11, Symphony
MLI3DS Materials Libraries3D Studio
MLRAWDataMoonlight Creator RAW format 3D object
MLVLabVIEW MathScript
MMText fileMultiMate Advantage II, FreeMind mind map file (XML)
MMSource codeObjective-C++
MMFMail message fileMicrosoft Mail
MMMMultimedia movie file, RIFF RMMP formatMacroMind Director 3.x
MMOMemo writer fileRapidFile
MMPOutput video format from Bravado board
MNMuPAD Pro NotebookWorkspace file of MuPAD (integrated in Matlab)
MNDMenu sourceAutoCAD Menu Compiler
MNGMapDeLorme Map'n'Go
MNTAdditional (FPT) menu description fileFoxPro
MNTMenu memoFoxPro
MNTSurface metrology or image analysis documentMountainsMap
MNUAdvanced macro fileHP NewWave
MNUMenuAutoCAD Menu Compiler – Norton Commander – Signature
MNUMicrosoft Mouse menu (for DOS apps)
MNXCompiled menu fileAutoCAD
MNXMain (DBF) menu description fileFoxPro
MNYAccount bookMicrosoft Money
MO?Packed mailFTN software
MOBDevice definition filePEN Windows
MOBIeBookMobipocket
MODAMPL model fileAMPL
MODModula language source
MODMODULA-2 source code fileClaridiv id="MDZ"> MDZon Modula-2
MODModule—used by Windows for DLL which implement DOS supportWin
MODMusic format (Amiga module)DMP – ST – MDP – VP
MOLMOD4WIN PlayListMod4Win
MOLMDL MolfileRasMol
MOL2Tripos’ Sybyl MOL2 FormatSYBYL, RasMol
MONSYSGEN monitor build procedureRT-11
MONMonitor descriptionReadMail
MOPMOPAC input fileMOPAC, RasMol
MOVAnimation format (Mac)QuickTime
MOVMovie fileAutoCAD AutoFlix
MP2Mpeg audio fileWinamp, xing
MP3MPEG audio stream, layer 3AWAVE, CoolEdit(+PlugIn), Winamp, many others
MP4multimedia container format, MPEG 4 Part 14Winamp
MPAMPEG audio stream, layer 1,2,3AWAVE
MPCCalendar fileMicrosoft Project
MPCMusepack audio
MPEGmultimedia containter format, video, audioMPEG Player, Winamp
MPGsee MPEG
MPKGMultipackage installer scriptMac OS X
MPLMediaRack Midi PlaylistMediaRack
MPMMathPlan macroWordPerfect Library
MPPProject fileMicrosoft Project
MPPZMagicPlot project fileMagicPlot
MPQMo'PaQ ArchiveBlizzard games
MPRGenerated executable menu fileFoxPro
MPRMultilizer 5.x and 6.x localization project fileMultilizer
MPRCommand & Conquer: Red Alert 2 map fileRed Alert 2
MPTBitmap graphics (Multipage TIFF)
MPVView fileMicrosoft Project
MPXCompiled executable menu fileFoxPro
MPXVideo format
MPZMiradi Project ZipfileMiradi
MRBMultiple Resolution Bitmap graphics fileMicrosoft C/C++
MRCmIRC filemIRC
MRKWindows User BenchmarkWin95
MRSMacro Resource fileWordPerfect for Win
MSMicrosoft antivirus reportMSAV
MSCMicrosoft C makefile
MSCmanagement saved console[1]Microsoft; Microsoft MMC[2]
MSDSecure and Encrypted Filemysecuredelivery/Download
MSDLManchester Scene Description Language
MSDVDWindows DVD Maker ProjectWindows DVD Maker
MSESet fileMagic Set Editor
MSGMessage base (e.g. HMB)
MSGMessage text file (ASCII)Microsoft Outlook
MSGZVoice digitized voice file
MSIWindows Installer PackageWindows Operating Systems
MSOMicrosoft Word OLE Web Page Storage StreamMicrosoft Office
MSOMicrosoft Outlook metadata for a Microsoft Word 2000 email attachment[3]Microsoft Outlook
MSPBitmap graphics fileMicrosoft Paint
MSPGraphics formatMicrosoft Paint
MSPRODUCERMedia ProjectMicrosoft Producer (for Microsoft PowerPoint XP/2003) Project
MSQMdataMicrosoft Message Queuing
MSNProjectNational Instruments for NI MultiSim-Electronic Circuit simulator
MSSManuscript text filePerfect Writer – Scribble – MINCE – Jove
MSTDocumentMS Test
MSTMinispecification fileProsa
MSTSetup script fileMicrosoft Windows SDK
MSWText fileMicrosoft Word
MSXCP/M archiveMSX
MTHMath fileDerive
MTLWavefront
MTMMusic formatMultiTracker
MTSMaster Track Pro FilesMTPro 4
MTSdataEA Sports F1 series, car physics
MTSMPEG 2 Transport StreamVarious media playback devices / software
MTVMTV Ray Tracer graphic file
MTWDatafileMinitab
MUQuattro pro for DOS Menu definition fileQuattro Pro
MUMMATLAB CAPE-OPEN Unit Operation Model fileMatlab
MUMMicrosoft update fileMicrosoft
MUSFinale music documentFinale
MUSMusic format (MIDI in Doom)
MUSSound fileMusicTime
MUZHover Game MIDI FileWindows' Hover! Game[4]
MVFStop frame fileAutoCAD AutoFlix
MVIMovie command fileAutoCAD AutoFlix
MVODataMad Virgin 3D object
MVWLog fileSaber LAN
MWFAnimationProMotion
MWSMWave DSP synths instrumentAWAVE
MXFMaterial exchange format (RFC 4539, SMPTE 377M)
MXLPackRat 5.0 support DLLsPackRat 5.0
MXMMaterialMaxwell Render
MXPAdobe Extension FileAdobe Dreamweaver and Adobe Flash
MXP3ds Max Configuration File3ds Max
MXPMasterCook exported recipe
MXTDataMicrosoft C
MYDa MyISAM data file in MySQLMyISAM, MySQL
MYPPresentationMM Make Your Point
MZBinary-format MapMazeEdit
MZEText-format MapMazeEdit
MZGBinary-format Map CollectionMazeEdit
MZXBinary-format Encrypted MapMazeEdit
N
NAMName Space ModulesNovell NetWare
NAPNaplps file (VideoShow)EnerGraphics
NAPLPSNorth American Presentation Layer Protocol Syntax
NBText fileNota Bene
NBWolfram Mathematica Notebook (see Wolfram Language)Mathematica
NBFNokia Backup FileNokia Mobile Phones
NBSMinecraft Note Block Studio fileMinecraft Note Block Studio
NCBinary DatanetCDF software package
NCInstructions for NC (Numerical Control) machineCAMS
NCNon-error checking preprocessed Goc source codeGeoworks
NCCCNC (Computer Numeric Control) control fileCamView 3D
NCDNC Drill File (Excellon Format, printed circuit board hole definitions)Most PCB layout software
NCDNorton Change Directory support fileNorton Commander
NCPRe-volt Collision fileRe-volt
NDNetConnect data file. Contains information on multi-user access to the company file.Intuit QuickBooks
NDBNetwork databaseIntellicom - Compex
NDSNintendo DS ROM file used for Homebrew and commercial (Game) files on DSNintendo DS
NDLNodelist file
NDXIndex filedBASE II - III - IV - dBFast
NEFNikon RAW image formatNikon cameras
NEISKorean Student Record DocumentStudent Record Writing Program
NEORaster graphics fileAtari Neochrome
NESiNES ROM image format
NETNetwork configuration/info file
NEUPro/Engineer neutral file formatPTC Pro/Engineer
netCDFNetwork Common Data Format
NEWAmeco Embroidery FormatEmbroidermodder
NEWNew info
NFFHaines Neutral File Format
NFFWorldToolKit Neutral File Format
NFOFolioview database
NFOHelp formatNextpage Folio
NFOInfo fileCompact NFO Viewer
NGHypertext DatabaseNorton Guide
NGCG-Code fileInkscape G-Code tools extension
NGONG linker object fileNGML
NGSNG compiler source fileNGC
NIFnetimmerse/gamebyro file
NILNILIcon Hear-It
NITFNational Imagery Transmission Format
NK2e-mail address autocomplete archiveMicrosoft Office Outlook
NLNorton Desktop Icon Library
NLMNetware loadable moduleNovell Netware
NLSNational Language Support fileMS-DOS
NLXFormFormWorx 3.0
nmfNode Map FileUsed by SpicyNodes
nnnArj archive volumes up to 999ARJ
nnnNetware unicode rule table (e.g. 1250_Uni.036)Novell Netware
nnnNews about smth with ext. of ver. number
nnnRAR archive volumes up to 999RAR
NOTNotation
NOTYard Notes FileFYM
NPProject schedule (Nokia Planner)Nokia Planner
NPISource for DGEN.EXE interpreterdBASE Application Generator
NPJNile ProjectGame Mission Editor
NPRNuendo Project FileSteinberg Nuendo
NRGNero Disc Image FileNero Express / Burning ROM
NRWNikon Coolpix RAW imageNikon
NSAmediaNullsoft Streaming Audio
NSFdatabaseLotus Notes
NSFMusic moduleNES Sound File
NSSNorton screensaver moduleNC - NDW Screen Saver
NSTMusic moduleAmiga Noise Tracker
NSVmediaNullsoft Streaming Video
NSXCompound index fileSuccessWare SIX 3.00
NTStartup filesWindows NT
NT3BAHN Layout fileJBSS BAHN
NTFdatabase design templateLotus Notes
NTHNokia Theme FileNokia PC Suite
NTRExecutable ASCII text file (strip header and rename)netrun31.zip
NTSExecutable ASCII text file (strip header and rename)netsend1.zip
NTSTutorialNorton
NTXDatabase index fileClipper 5
NUFMessage for new users on their 1st callProcomm Plus
NUMBERSNumbers spreadsheet fileNumbers (Apple iWork '08)
NVNewViews DOS accounting databaseQW Page NewViews
NV2NewViews accounting databaseQW Page NewViews
NWSInfo text file (latest news) (ASCII)
NXTSound (NeXT format)
O
O$$OutfileSprint
OObject fileUNIX - Atari - GCC
O01Typhoon vOice fileAWAVE
OAZFaxNetFax Manager
OBObject cut/paste fileIBM LinkWay
OBDMicrosoft Office BinderMSOffice
OBJCompiled machine language code
OBJObject codeIntel Relocatable Object Module
OBJWavefront Object
OBJFDataTriangle strips object
OBRObject browser data fileBorland C++
OBSScriptObjectScript
OBTMicrosoft Office Binder TemplateMSOffice
OBVVisual interfaceObjectScript
OBZMicrosoft Office Binder WizardMSOffice
OCFObject Craft FileObject Craft
OCDOCAD Map FileOCAD
OCRIncoming fax transcribed to textFAXGrapper
OCTMusical filePctalizer
OCXNew Custom Control's format in VB 4.0Visual Basic
OCXOLE custom control
ODBOpenDocument databaseOpenOffice.org / LibreOffice Base
ODFOpenDocument formulaOpenOffice.org / LibreOffice Math
ODGOpenDocument drawingOpenOffice.org / LibreOffice Draw
ODIFOpen Document Interchange Format
ODLObject Description Language
ODLType library sourceVisual C++
ODMOpenDocument master documentOpenOffice.org / LibreOffice Writer
ODPOpenDocument presentationOpenOffice.org / LibreOffice Impress
ODSOpenDocument spreadsheetOpenOffice.org / LibreOffice Calc
ODTOpenDocument text documentOpenOffice.org / LibreOffice Writer
OEACCOUNTXML format, account filesMicrosoft e-mail software: Outlook Express, Windows Mail, Windows Live Mail, Microsoft Outlook
OFDForm definitionObjectView
OFFObject File Format vector graphics file
OFFObject File Format vector graphics
OFMPostScript font description file
OFNMicrosoft Office documentsMicrosoft Office
OGGOgg multimedia container format
OHBSourceOn Hand Basic
OHSOutbound HistoryBink/+
OIFQuickBase file format
OKTMusic (8 channels)Oktalyzer
OKTMusic formatOktalyzer
OLBObject libraryVAX
OLDBackup file
OLIText fileOlivetti
OLSRConfiguration fileolsrd
OMAAudio fileLabelgate CD 2, MAGIQLIP2
OMGAudio fileSony compressed audio file (ATRAC3)
OMFOpen Media FrameworkAvid Media Composer
OOFDataOutrage 3D Object Format (Descent)
OOGDataWEBOOGL 3D object
OOMSwap fileShroom
OPJOrigin Project FileOrigin version 4.1 and later
OPNActive optionsExact
OPTOptionsname used by many programs for configuration information
OPTDelphi project optionsBorland Delphi
OPTOptimize support fileQEMM
OPUSOgg/Opus audio filempv, mplayer, many others (official file format).
OPWOrganization chartOrg Plus for Windows
OPXInactive optionsExact
ORAParameter fileOracle
ORCOrchestra MIDI fileCSound
ORGCalendar fileLotus Organizer
ORGOlder Origin ProjectOrigin versions 4 or earlier
OSKosu! skinosu!
OSRosu! replayosu!
OSZosu! beatmaposu!
OTGOpenDocument drawing templateOpenOffice.org / LibreOffice Draw
OTBOver-the-air bitmap graphics
OTFSubtitle font information for media contentMedia players / software which support PGS subtitling
OTHOpenDocument HTML document templateOpenOffice.org / LibreOffice
OTLOutline font descriptionZ-Soft Type Foundry
OTLVentura Publisher's Type Foundry Outline Editor format
OTLThe Vim OutlinerA vim plugin
OTPOpenDocument presentation templateOpenOffice.org / LibreOffice Impress
OTSOpenDocument spreadsheet templateOpenOffice.org / LibreOffice Math
OTTOpenDocument text document templateOpenOffice.org / LibreOffice Writer
OTXText fileOlivetti Olitext Plus
OUTOutput file
OUTDesign II for Windows Output file
OV1Overlay file (part of program to be loaded when needed)
OV2Overlay file (part of program to be loaded when needed)TomTom Point of Interest
OVDDatafileObjectVision
OVLOverlay file (part of program to be loaded when needed)
OVROverlay file (part of program to be loaded when needed)
OXTOpenOffice.org extensionOpenOffice.org / LibreOffice
P
PDatabase PROGRESS source codePROGRESS
PPASCAL source code file
PParser source code file
PPicture fileAPPLAUSE
PRea-C-Time application parameter fileReaGeniX code generator
P0?Split archive UC2SAS.EXE
P10Tektronix PlotGCGW
P10Certificate Request
P12Personal Information Exchange"Crypto Shell Extensions"
P16Music (16 channels)ProTracker Studio 16
P22Patch file (Patch22)Patch22
P80PLM-80 source
P86PLM-86 source
p2vBackupfile of a project in eventplanning software plan2viz (windowsbased)
P3TPlayStation 3 Theme filePS3 Theme settings menu
PA1WorktablePageAhead
PACSBStudio II Package or SongSBStudio II
PACSTAD Image (graphics ?)
PACK??
PACKAGEContentsThe Sims 2 - Spore - The Sims 3
PADAutomatic print definitionsProdua
PADKeypad definitionTelemate
PAFFor Personal Ancestral File data files
PAGESPages document filePages (Apple iWork '08)
PAKArchivePak
PALPalette fileMicrosoft Draw - Win. Paintbrush - many
PALPalette fileDiablo II
PAMPAM Portable Arbitrary Map graphics formatNetpbm
PANPrinter-specific file (copy to coreldrw.ink)CorelDRAW
PARParameter fileFractint
PARPARTS applicationDigitalk PARTS
PARPermanent output fileWindows 3.x
PARParity Archive
PAR2Parity Archive v2
PARTPart of a download file
PASPascal language sourceBorland Pascal
PATGravis Ultrasound PatchConvert (c) Villena
PATHatch patternsAutoCAD - Photostyler
PATVector fill filesCorelDRAW
PATPattern FilePhotoshop
PATGIMP pattern
PBFaxFAXability Plus
PBPhonebookWinFax Pro
PBProboard Conf. filesProboard
PBSetup filePixBase
PB1DocumentFirst Publisher for Windows
PBAPowerbasic BASIC source codeGenus
PBDPhone bookFaxNOW! - Faxit
PBDMolecule (protein data bank)
PBIPowerbasic include fileGenus
PBIProfiler Binary InputMicrosoft Source Profiler
PBKMicrosoft Network Phone bookMSN
PBLPowerbasic libraryGenus
PBLIBPower LibraryPowerBASIC
PBMPBM Portable Bit Map graphics formatJasc Media C
PBMPlanar bitmap graphicsXLib
PBOProfiler Binary OutputMicrosoft Source Profiler
PBTProfiler Binary TableMicrosoft Source Profiler
PCText file containing IBM PC specific info
PC3Custom paletteHarvard Graphics 3.0
PC8ASCII text IBM8 character setNewWave Write
PCAPerfect Clarity AudioSony Vegas Pro
PCBP-CAD databaseP-CAD, PCBExpress, and other Printed Curcuit Board design software
PCBArtwork design file (Circuit board design)Zuken CadStar
PCCCutout picture vector graphicsPC Paintbrush
PCDGraphics format (Kodak Photo-CD)
PCDKodak Photo-CD Image graphics file (768x512)hpcdtoppm
PCDPfaff Embroidery FormatEmbroidermodder
PCFPixel Coordination Format
PCHPatch file
PCHPrecompiled headerMicrosoft C/C++
PCJMultimedia authoring tool graphics fileIBM's Linkaway-Live
PCKPickfileTurbo Pascal
PCLHP-PCL graphics data fileHP Printer Command Language
PCMOKI MSM6376 synth chip PCMAWAVE
PCMPCMAuthorware
PCMPfaff Embroidery FormatEmbroidermodder
PCQPfaff Embroidery FormatEmbroidermodder
PCSMicrosoft PowerPoint picture packageMicrosoft PowerPoint - Microsoft ClipArt Gallery
PCSPCSurvey filePCSurvey by Softart - Land Surveying Software
PCSPfaff Embroidery FormatEmbroidermodder
PCTBitmap graphics fileMacintosh b&w PICT1 - color PICT2
PCWText filePC Write
PCXPC paintbrush bitmap formatQPeg - Display - ZSoft - PC Paintbrush, XnView
PDABitmap graphics
PDBPackrat 5.0 data filePackrat 5.0
PDBcontainer format (envelope) for Palm OS databasesPalm OS, Garnet OS, Access Linux Platform, e-book
PDBdebugging dataMicrosoft Windows
PDBMolecule (protein data bank)
PDDAdobe Photoshop Elements ImageAdobe Photoshop Elements
PDEPathology Data Exchange
PDEdataPowerDesk Encrypted
PDFAdobe's Portable Document FormatAdobe Acrobat Reader
PDFGraphics file (ED-SCAN 24bit format)
PDFPackage Definition File
PDFPCAD Database Interchange FormatPdifin.exe - Pdifout.exe
PDFPrint device information Netware
PDGPrint Shop Deluxe data file
PDIPortable Database Image
PDLProject Description Language fileBorland C++ 4.5
PDMProgramDeskmate
PDMPowerDesigner's physical data model (relational model) file formatPowerDesigner
PDMVisual Basic (VB) Project Information FileVisual Basic
PDNImage filePaint.NET
PDSPALASM Design Description
PDSPds graphics
PDSPlanetary Data System Format
PDSPldasm source code file (hardware assembly)
PDVPrinter driverPaintbrush
PDWDocumentProfessional Draw
PEBProgram Editor bottom overflow fileWordPerfect Library
PEDProgram Editor delete saveWordPerfect Library
PEMProgram Editor macroWordPerfect Library
PEQProgram Editor print queue fileWordPerfect Library
PERProgram Editor resident areaWordPerfect Library
PESProgram Editor work space fileWordPerfect Library
PETProgram Editor top overflow fileWordPerfect Library
petpackage[5]Puppy Linux
PEXProboard EXecutable file (Executed from PB)Proboard
PFAPostScript Font File
PFAType 3 font file (unhinted PostScript font)
PFBAdobe Acrobat documentAdobe Acrobat Reader
PFBPostScript fontAdobe Type Manager (ATM)
PFC(Personal Filing Cabinet) contains e-mail, preferences and other personal informationAOL
PFCText fileFirst Choice
PFKProgrammable function keysXTreePro
PFMPostScript Type 1 font metric fileMicrosoft Windows, Adobe Acrobat Reader
PFMWindows Type 1 font metric file
PFSDatabase (PFS:FILE) - text file (PFS:Write)PFS
PFTPrinter fontChiWriter
PGPage cut/paste fileIBM LinkWay
PGD PGP cripted disk
PGIPrinter Graphics File device driverPGRAPH library
PGLHP Plotter vector graphics format
PGMGraphics format (Portable GrayMap)JASC Media C
PGMProgramSignature
PGPSupport filePretty Good Privacy RSA System
PGSManual pageman4dos
PHOptimized .goh fileGeoworks
PHPerl header file
PHPhrase-tableMicrosoft C/C++
PHDPolyHedra Database
PHMPhone bookDN - Lync
PHNPhone listUltraFax - QmodemPro
PHOPhone databaseMetz Phone for Windows
PHPPHP file
PHP3PHP 3 file
PHP4PHP 4 file
PHFDatabase FileNuverb Systems Inc: Donarius
PHRPhrasesLocoScript
PI2Portrait Innovations High Resolution Encrypted Image filePortrait Innovations Studio2 (proprietary)
PIC123 Vector graphics formatCShow - Alchemy - Paint (Pictor)
PICBitmap graphics fileMacintosh b&w PICT1 - color PICT2
PICLotus picture
PICPIXAR picture fileSDSC Image Tool
PICTMacintosh Picture
PIEGlovePIE script fileGlovePIE
PIFOS/2 graphics metafilePICVIEW.EXE
PIFProgram Information FileWindows 3.x, 9x, NT
PIFVector graphics GDF format file (IBM mainframe computers)
PiMPascal Text Mode Image FileThe Ultimate Draw
PIPEPIPE-FLO project design filePIPE-FLO Professional
PITCompressed Mac file archive created by PACKITunpackit.zoo
PITPartition Information Table for Samsung's smartphone with AndroidOdin3
PITFile used to connect to a remote system.Dell (previously Quest) vWorkspace
PIVPivot Stick Animator filePivot Stick Animator
PIXAlias image fileSDSC Image Tool
PIXInset Pix
PJProjectCA-SuperProject
PJTAdditional (FPT) project description fileFoxPro
PJXMain (DBF) project description fileFoxPro
PKPacKed bitmap font bitmap file (TeX DVI drivers)
PKPeak fileCool Edit
PKLPickle filePython object serialization
PK2Quake 2 data fileid Software
PK3Quake 3 data fileid Software
PK4Doom 3 and Quake 4 data fileid Software
PKAArchivePKARC
PKGInstaller scriptNext, Mac OS X, Sony PS3
PKGP-CAD databaseP-CAD
PKTFido message packetFTN software
PLPaletteHarvard Graphics
PLPerl source code file
PLProlog source code file
PLProperty List font metric fileTeX
PL1Room plan3D Home Architect
PL1PL/I source filePL/I compilers
PL2PaletteDiablo II
PL3Chart paletteHarvard Graphics 3.0
PLAPlaylist
PLANTUMLUML Diagram (also PU)PlantUML
PLBFoxPro libraryFoxPro
PLBP-CAD libraryP-CAD
PLCAdd-in file (functions - macros - applications)Lotus 1-2-3
PLCP-CAD databaseP-CAD
PLDPhotoLine DocumentPhotoLine image processing
PLEEncrypted Chat LogMessenger Plus! Live Plugin - Log viewer
PLIPL/I source filePL/I compilers
PLISTMac OS Property List, also used on iOS, NeXTSTEP, and GNUstepApple's Property List Editor
PLLPrelinked libraryCA Clipper
PLMDisorderTracker2 music moduleAWAVE
PLNSpreadsheetWordPerfect for Win
PLPPlaylist
PLPMessenger Plus! Sound PackMessenger Plus! Live Plugin
PLSPlaylist fileWarpVision (OS/2)
PLSCMessenger Plus! Script PackMessenger Plus! Live Plugin
PLSKMessenger Plus! Skin PackMessenger Plus! Live Plugin
PLTHPGL plotter file vector graphicsAutoCAD
PLTOutput file for ploter
PLTP CAD: Output file editor for PCPLOT or PCPRINTP CAD
PLTPage Magic 2.0 paper formatPage Magic 2.0
PLTPalette
PLTTable for .pllCA Clipper
PLYDataPopMail
PLYPresentation screenHarvard Spotlight
PLYZipPack
PLYPolygon File Format or the Stanford Triangle Format.3D Scanners
PLY2DataPLY2 object
PMAuran Jet progressive mesh file (obsoleted by IM and LM)Trainz
PMPerl module
PMBitmap graphicsPresentation Manager
PM3PageMaker 3.0 data filePageMaker 3.0
PM4DocumentPageMaker 4
PM5Aldus PageMaker 5.0 publicationAldus PageMaker
PMAPMarc Archive
PMCGraphicsA4TECH Scanner
PMIOS/2 V3 SVGA PMI-FileSvga.exe
PMIPhatPad notePathWare
PMMProgram fileAmaris BTX/2
PMPPhotoMorph ProjectPhotoMorph
PN3Printer device driverHarvard Graphics 3.0
PNGPortable Network Graphics
PNCLPinnacle filePinnacle by Optys Tech Corporation
PNFPre-compiled Setup Information fileMicrosoft Windows
PNMPBM Portable aNy Map graphics file
PNTMacintosh painting
PNTPointlist segmentFTN software
PNTQWK reader pointer fileMarkMail 2.x
PODUNIX perldoc File ("Plain Old Documentation")pod2man, pod2html
POFAltera FPGA programming file (External Flash)Altera Quartus
POHOptimized .goh fileGeoworks
POLInnovMetric Software Polygon Models Format
POLICYGroup Policy FileMicrosoft Windows
POLYDataPatrick Flynn's Poly Format - 3D object
POPMessages indexPopMail
POPPop-up menu objectdBASE Application Generator
POTMicrosoft PowerPoint template
POVRaytraced graphics imagePersistence Of Vision
POWPower Chords instrument/song filePower Chords
PPAmiga archivePOWERPACKER
PPAMicrosoft PowerPoint Add-in
PPBButton bar for Print PreviewWordPerfect for Win
PPDPostScript printer description file
PPJPremiere ProjectPremiere
PPKArchive (using for many distributives)PPK
PPLPolaroidPalettePlus ColorKey device driverHarvard Graphics 3.0
PPMGraphics format (Portable PixelMap)JASC Media C.
PPOPreprocessor outputCA Clipper 5.*
PPPPublicationPagePlus
PPSStoryboardPersonal Producer
PPSMicrosoft PowerPoint Slideshow (stand alone slideshow)
PPTMicrosoft PowerPoint PresentationMicrosoft PowerPoint
PPTXMS Office Open-XML PresentationMicrosoft PowerPoint
PPSXMS Office Open-XML Auto-Play PresentationMicrosoft PowerPoint
PR1Packrat 4.0 data filePackrat 4.0
PR2Packrat 4.x data filePackrat 4.x
PR2PresentationAldus Persuasion 2.x
PR2Printer driverdBASE IV
PR3PostScript printer driverdBASE IV
PR3PresentationAldus Persuasion 3.x
PRCcontainer format (envelope) for Palm OS databasesPalm OS, Garnet OS, Access Linux Platform, Mobipocket
PRC"Product Representation Compact", for embedding 3D data in a PDF fileCAE and CAM applications
PRDPrinter driver
PREPresentationFreelance Graphics
PRESettingsProgrammer's WorkBench, Microsoft C/C++
PREStork graphic file
PRFCheckIt Pro v1.0 data fileCheckIt Pro 1.0
PRFPixel Run Format graphics fileImproces - Fastgraph
PRFPrinter driverdBASE IV
PRFProfiler output
PRGProgram source code (e.g. Clipper language)CA Clipper
PRGProgram sourcedBASE IV - FoxPro - Clipper 5 - dBFast
PRGProgramAtari
PRIPrinter definitionsLocoScript
PRJBorland C++ IDE project fileBC.EXE - BCW.EXE
PRJMkd (Unix command)Mkd project file to extract documentation
PRKSimPark Saved FileSimPark
PRMParameters
PRNPrinter driverSignature
PRNText fileLotus 1-2-3 - Symphony
PRNUsually printer output file
PROProfileused by many programs to store configuration data
PROGraphics profile fileDOS
PROProboard conf. fileProboard
PROPunch! Home Design FilePunch! Home and Landscape
PROProlog language source
PROPROLOG source code file
PROJProject File (Interface Builder)NeXT
PROPERTIESJava properties fileJava applications
PROTOMessage specificationGoogle Protocol Buffers
PRRThe Perfect Resume data filePerfect Resume
PRSNorton Viewer DLL file
PRSPresentationHarvard Graphics Win
PRSPrinter Resource e.g. fontsWordPerfect for Win
PRSProceduredBASE IV
PRTP-CAD componentP-CAD
PRTPart or DrawingCadkey
PRTPrinter driverDr. Halo
PRXCompiled programFoxPro
PSDocument in PostScript formatadobe
PSAArchive (Pretty Simple Archive)PSA.OUT (GNU)
PSBFor big Photoshop filesPhotoshop Document
PSDDesign II for Windows Process Simulation Diagram
PSDPeriscope Debbuger Def filePeriscope
PSDPhotoshop bitmap filePhotoshop document
PSEsee PSEG
PSEGBitmap graphicsIBM printer Page SEgment
PSFOutline PostScript printer fontChiWriter
PSMMusic format (Protracker Studio Module)Protracker - MASI
PSMSymbol table of IDETurbo Pascal
PSM3D Model18 Wheels Of Steel
PSNPresentation file for Sound ScriptWin
PSPimage file with layersPaint Shop Pro (all versions)
PSQPremiere SequencePremiere
PSTPostbox fileBMail
PSTArchive FileMicrosoft Outlook
PSVPlayStation 2/PlayStation 3 saved gamePlayStation 2 and PlayStation 3
PSWFile w/ passwords for any program/gamemany
PTGame crackPlayer Tools
PTKodak Precition Color Management System
PT3Device driverHarvard Graphics 3.0
PT3TemplatePageMaker 3
PT4TemplatePageMaker 4
PT5Aldus PageMaker 5.0 publication templateAldus PageMaker
PTBPower Tab SoftwarePower Tab Editor
PTBScriptPubTech BatchWorks
PTFPlayStation Portable Theme filePSP Theme settings menu
PTFPro Tools Session FileDigidesign Pro Tools
PTGPanasonic Title Graphics
PTLPremiere TitlePremiere
PTMMacroPubTech BatchWorks
PTMMusic format
PTMPage Magic 2.0 templatePage Magic 2.0
PTNPatternCadkey
PTNPatternCarveWright/CompuCarve Designer
PTROS/2 cursor image fileICONEDIT.EXE
PTRQWK reader pointer fileQMail
PTUPerformer Terrain Utilities
PTXPro Tools 10 session fileAvid Pro Tools
PUUML Diagram (also PLANTUML)PlantUML
PUBPackage FileExstream Dialogue
PUBPage templateMicrosoft Publisher
PUBPublic key ring filePretty Good Privacy RSA System
PUBPublicationVentura Publisher - 1st Publisher
PUDWarcraft II Map fileWarcraft II
PUTArchivePUT
PUTGraphics formatWScan
PVDScriptInstalit
PVKPrivate Key FileMicrosoft Authenticode
PVLLibraryInstalit
PVMTexture FilesPVMEdit
PVTLocal Fidonet pointlistFTN software
PWText fileProfessional Write
PWFWorkflow FilesMac OS X Server Podcast Producer
PWKWorkspace FilePolyWorks
PWLPassword List
PWPText documentProfessional WritePlus
PXParadox 3.0 fileParadox 3.0
PXP3DS Process file3D Studio
PXRPixiar PicioAltamiraComposer
PXZCompressed file to exchange media elementsPSALMO
PYPython script filePython interpreter
PYCCompiled Python modulePython interpreter
PYDPython DLLPython interpreter
PYICognos Powerplay Model
PYKPYK Compressed FilePYK
PYOOptimized compiled Python modulePython interpreter
PYWPython Script Without Console WindowPython interpreter
PZDDefault settingsPizazz Plus
PZIGraphics formatPZP
PZOOverlay filePizazz Plus
PZPPalettePizazz Plus
PZSSettingsPizazz Plus
PZTTransfer filePizazz Plus
PZXSwap filePizazz Plus
Q
Q0Q0 graphic file
Q3SDataQuick3D Scene
QAGQuick Access GroupNorton Desktop
QAPApplicationOmnis Quartz - Omnis Studio
QBTony Hawk's Pro Skater series scripting files
QBBQuickbooks Backup File
QBESaved query (Query By Example)dBASE IV - Quattro Pro
QBOCompiled querydBASE IV
QBWSpreadsheetQuickBooks for Windows
QCHQt Compressed HelpTrolltech Qt Assistant
QCPMp3 extension on Motorola ringtonesMotorola Phones
QDFData fileQuicken data file
QDKBackup of startup files created by OptimizeQEMM
QDnData file - segment nOmnis Quartz- Omnis Studio
QDVGraphics fileSteve Blackstock Giffer
QDRConfiguration fileQ-Dir
QEFQuery fileQ+E for Microsoft Excel
QFXQuicken-specific implementation of the OFX specificationIntuit Quicken
QFXFaxQuickLink
QG3DataQuickMem Greek
QHCQt Help CollectionTrolltech Qt Assistant
QHCPQt Help Collection ProjectTrolltech Qt Assistant
QHPQt Help ProjectTrolltech Qt Assistant
QIFQuicken Interchange FormatIntuit Quicken
QIZWorld book quizWorld Book
QLBQuick libraryMicrosoft C/C++
QLCATM Type 1 fonts scriptAdobe Type Manager
QLPPrinter driverQuickLink
QM4Options or services fileQMail 4.x Mail Door
QPRGenerated query programFoxPro
QPRPrint queue device driverOS/2
QPXCompiled executable QBE query fileFoxPro
QRPDatabase report fileQuickReport
QRSEquation Editor support fileWordPerfect for Win
QRTGraphics format (QRT ray tracing)
QRYQuerydBASE IV
QTQuickTime movie (animation)
QTVRQuickTime VR Movie
QUOXQuestion Object DocumentQuobject Designer and Quobject Explorer
QVDQlikView Document (Data)QlikView Compressed Database File
QVWQlikView Document (View)QlikView Presentation File
QWKQWK reader message file
QXDDocumentQuarkXPress
QXLElement libraryQuarkXPress
R
RRatfor file
RScript fileR
R00, R01, ...Part of a multi-file RAR archive
R2DReflex 2 datafileReflex 2
R3DRed Raw Video (raw video data created with a Red camera)Red Camera
R8Raw graphics file (one byte per pixel) plane onePicLab
R8PPCL 4 bitmap font fileIntellifont
RARemote Access conf. filesRA
RA0, RA1, ...Part of a multi-file RAR archive
RAD2-op FM musicReality AdLib Tracker
RADRadiance
RALRemote Access Language fileRemote Access
RAMRamfileRealAudio
RARArchiveRAR
RASGraphics formatSUN Raster
RATDatafile (RATS)
RAWHSI raw graphic file
RAWPCM Signed Raw Sound File
RAWQRT graphic file
RAYRayshade
RBRuby Script file
RBFDatafileRbase
RBXMROBLOX "model"ROBLOX
RBXLROBLOX "level"ROBLOX
RCConfiguration fileemacs
RCResource Compiler script fileMicrosoft C/C++, Borland C++
RCResource ScriptResource Writer
RCUUPC configuration filesUUPC
RCWindows resource compiler scriptRC.EXE -Resource WorkShop - OS/2
RCGNetscape newsgroup file (netsc.rcg)
RCTRoller Coaster Tycoon
RDataData fileR
RDFCompiled UIC source codeGeoworks UI Compiler
RDIDevice-independent bitmap file (RIFF RDIB format)
RDPRDP connectionRemote Desktop connection
RDXDatafileReflex
RECArchivation protocolARCSERVE
RECDatafileEpiInfo
RECRecord fileSprint
RECWindows Recorder Macro FileWinRecorder
REDPath infoClarion Modula-2
REDREDuced nodelist fileT-Mail nodelist Compiler
REFCross-reference
REGOLE Registration fileWindows 3.x
REGRegistration information or key
RELForeground job relocatable fileRT-11
REMRemarks definitionSourcer
REMRemarks
REPQWK reader reply file
REPReport file used by many applications
REPReportReport Designer - CodeReporter - DataBoss
REQFile requestFTN Software
RESCompiled resourceMicrosoft C/C++, Borland C++
RESDBASE resourcesdBASE IV
RESWindows compiled resource packageWin
REVRevision fileGeoworks
REXPharLab executable file (old format)PharLab
REXReport definitionOracle
REXRexx language source fileRexx
REZResource file
RFSun raster graphics file
RFMReport ForMat (script for customized report)Nuverb Systems Inc: Donarius
RFTDCA/RFT Revisable Format Text fileIBM DisplayWrite 4.0-5.1
RGBSGI RGB image file (RAW)SDSC Image Tool
RGXSymbol tables etc. infoReaGeniX code generator
RHResource header fileBorland C++ 4.5
RHWindows resource file headerRC.EXE
RHistoryCommand history logfileR
RIDataLotus 1-2-3
RIBGraphics (Renderman Interface Bytestream)3D Reality
RICFaxRicoh
RIFRIFF bitmap graphics (Resource Interchange File Format)Fractal Design Painter
RIPTeleGrafix Remote Imaging ProtocolMaximus 3.0
RIXGraphics (ColoRIX Image File)ColoRIX
RL4Bitmap graphics
RL8Bitmap graphics
RLAWavefront raster image fileSDSC Image Tool
RLBData hgw.rlbHarvard Graphics Win
RLCGraphics 1bit/pixel scanner output
RLDNorton Commander 5.0 temp fileNC 5.0
RLDOSIMapDef. RecLoad Definition
RLEUtah Run Length Encoded rasterfile graphic fileSDSC Image Tool
RLZREALIZER source code fileCA-Realizer
RMRealMediaRealPlayer
RMBdataRegistryMaster
RMIWindows alternate synthesized sound formatRIFF RMID format
RMKMake fileCA Clipper - RMAKE
RMVBRealMedia Variable BitrateRealPlayer
RNXPL program for Nota Bene users
RNAReal Native Application File
RNDRendering SlideAutoCAD AutoShade
RnnMulti volume RAR archiveRAR
RNORunoff fileVAX
ROLFM music Adlib Music FileRoland
ROMRead Only Memory image in emulators, AONs, etc.
ROOCODASYL DBMS Database RootOracle
RPBData report file used by CP BackupCP Backup
RPCRich Photorealistic ContentArchVision
RPDDatabaseRapidFile
RPFAutoCAD patternACAD
RPLText documentReplica
RPMRed Hat Package ManagerRed Hat Linux
RPTReport file used by many applications
RRDReduced Resolution DatasetESRI (GIS)
RSData fileAmiga Resource - Reassembler
RSRust language source
RS_Resource fork of a Macintosh fileMac-ette
RSCResource fileViewMax - many
RSLApplication - Projectresolver one
RSLResource Library used by PC Tools for WindowsPC Tools - Win
RSPResponse file (text file containing input expected by e.g. LINK)
RSPResponse FileOS/2
RSTreStructuredTextDocutils
RSYFLEXIT Multishot Survey Raw Data fileFLEXIT
RTFRich Text Format text file (help file script)many - Microsoft Word
RTFDRTF-PacketNeXT
RTLHP RTL graphic file
RTLRun-Time libraryNorton Utilities
RTLText file
RTPRTPatch software update package data filePocket soft patch
RTSRealizer executable file
RTSRuntime library fileCA-Realizer
RULEcho-conference rules
RUNAMPL script fileAMPL
RUNPC Tools for Windows batch filePC Tools
RUNZpseudo-executable file, used in Portable Apps and software installers for Super OSRUNZ Framework
RUSRussian text
RVMobile pricelist data fileMobile
RVF TRichView
RVWReview
RVRaw Wind Data
RWSBorland Resource Workshop symbol fileResource Workshop
RWSResource Workshop data fileBorland C++
RWXCriterion RenderWare
RWXMEME Shape File
RWXScriptRenderWare
RWZMicrosoft Outlook Rules Wizard FileMicrosoft Outlook
RXDReflex 1 datafileReflex 1
RZKFile Crypt password fileAll text editors
RZXFile Crypt encrypted fileFile Crypt (Akte Krypta, Kriptirnik)
S
S$$Temporary sort fileSprint
SASSEMBLY source code fileunix
SMulti Edit macro file sourceMulti Edit
SMSTS Shape fileMSTS
S19Motorola ASCII format of executables
S1KS1000 Simnet Format
S3IDigiplayer/ST3 Sample FileDigiplayer - ST3
S3MMusic (16 channels)Scream Tracker 3.0 - DMP
S7ISeed7 library / include fileSeed7 interpreter and compiler
SA?Packed mailFTN software
SABSaber fileStar Wars: Jedi Knight Jedi Academy
SAFsee SAIF
SAFESafeIT Encrypted
SAIFSpatial Archive Interchange Format
SALDatafileSORITEC
SANLucasArts' SMUSH/INSANE animation
SAMAmi Pro data fileAmi Pro
SAMText fileSamna - Lotus Ami/Ami Pro
SAPAtari SAP music format
SARArchiveSAR
SATACIS ACIS .sat
SATSStatic sourceATS
SAVBackup file (saved file)
SAVConfiguration
SAVExecutableRT-11
SAVSPSS "System File"PSPP
SAVSaved game stateSpider Solitaire (Windows)
SAVERScreensaverMac OS X
SBAudio file (signed byte)
SBRaw Signed Byte (8bit) dataAWAVE
SBRaw Signed PCM Byte 8bit dataAWAVE
SBScratch projectScratch
SB2Scratch 2.0 projectScratch
SBDStoryboardStoryboard Editor
SBHHeaderScriptBasic
SBISound Blaster Instrument file (Creative Labs)
SBKEmu SoundFont Bank (AWE32 Bank)Convert (c) Villena
SBLStony Brook Pascal librarySB Pascal
SBPDML programSuperbase 4
SBRSupport fileSource Browser
SBTNotes related to recordSuberbase 4 Windows
SCDisplay driverFramework II
SCPAL scriptParadox
SCScriptBorland Paradox
SC3Renamed dBASE III screen mask filedBASE IV
SC3Screen device driverHarvard Graphics 3.0
SC3Saved CitySimCity 3000
SC4Saved CitySimCity 4
SC4Game ScenarioRollerCoaster Tycoon Deluxe/Expansion Pack
SC6Game ScenarioRollerCoaster Tycoon 2
SCADatafileSCA
SCCText file
SCDSCODOL film recorder (Scan Conversion Object Description Language)SCODOL
SCFStandard Chromatogram FormatDNA Baser Assembler
SCFStandard Chromatogram FormatStaden package
SCF?SimAnt or SimTown ??
SCFWindows Explorer Command (e.g.: show desktop.scf)Windows Explorer
SCFMultimedia showScoreMaker
SCFSpelling checker configuration fileSymphony
SCHProject scheduleSchedule Publisher
SCHCircuit Design SchematicP-CAD - Orcad - Protel
SchDocCircuit Design SchematicProtel - Altium Designer
SCHEMATICMCEdit Schematic fileMCEdit Tool for Minecraft
SCIFaxSciFax
SCISystem Configuration Information
SCMScheme source code file
SCMSchematic file (Circuit Diagram for PCB design)Zuken CadStar
SCMStarCraft mission
SCNSCeNe RTrace
SCNScreen fileKermit
SCOHigh score
SCPScriptBITCOM
SCRAny other screen system
SCRDEBUG source code fileDOS Debug
SCRForth screen (source) fileForth
SCRScreen - screen snapshotdBASE IV - Procomm Plus
SCRScreen fontLocoScript
SCRScreen saverWindows 3.x
SCRScreen snapshop
SCRScript file sourceTeleMate - Kermit - 1st Reader
SCTAdditional (FPT) screen description fileFoxPro
SCTORRaster graphics format used by some very obscure custom operating systems
SCXChartStanford Chart
SCXGraphics formatColoRIX
SCXMain (DBF) screen description fileFoxPro
SCXStarCraft: Brood War scenarioStarCraft: Brood War
SCYSecurity fileReaGeniX
SDSound Designer I audio fileAWAVE
SD7Seed7 source fileSeed7 interpreter and compiler
SDAFidonet's Software Distribution Network file archive description
SDCVideoDigimaxMaster - Samsung NV3
SDCSynopsys Design ConstraintsElectronic Design Automation Tools
SDFMicrosoft SQL Server Compact Edition database file
SDFFlight datamicrodrones GmbH
SDFSource definition fileSourcer
SDFSystem Data Format file (fixed length ASCII text)
SDISoftware Distribution Network Info file
SDKRoland S-550/S-50/W-30 Disk Image
SDLAlias Wavefront Scene Description Language
SDMSigned Differential Mapping brain maps and/or distributionsSigned Differential Mapping
SDMLSpatial Data Modeling Language
SDNSoftware Distribution Network compressed file archivepak251.exe
SDRSmartDraw FileSmartDraw Pro
SDSMIDI Sample DUMP Standard File
SDSSelf Defining Structure provides for N-dimensional very large datasets using HHCodegeographic information systems and relational database management systems
SDTSSpatial Data Transfer Standard
SDWAmi Draw Symbol File
SDXSample DUMP Exchange File
SEASelf-Extracting compressed Macintosh file Archive
SECcompressed file
SECDiskreet encrypted fileDiskreet
SECSecret key ring filePretty Good Privacy RSA System
SECSecured animation fileDisney Animation Studio
SEDSelf extraction directive fileIExpress
SENScifer Archive Format (Internal Header Mode)
SEPPrinter separator page
SEQABI Text SequenceApplied Biosystems
SEQAtari animation file
SEQVideoTiertex video sequence
SEQSequential Instruction FileBubble Chamber
SESSession infoClarion Modula-2
SESMultitrack Audio Session infoAdobe Audition
SETConfiguration file1st Reader
SETDriver sets created by InstallSymphony
SETExtension used by Norton Backup and CPS Backup for setup infoNorton Backup - CPS Backup
SETHump Assignments FileFYM
SETSetup options file
SETYVD card set fileYVD
SFIRCAM Sound FileCSound package - MixView sound sample editor
SFJAR Digital Signature
SFWPS attribute storage (OS/2 WorkPlace Shell) wp_root.sfOS/2 WorkPlace Shell
SF2Emu SoundFont Bank v2.0 fileAWAVE
SFBConfiguration fileemacs
SFBHP Soft font (obsolete under Windows)
SFDSoundStage Data fileAWAVE
SFFStandard Flowgram FormatDNA Baser SFF Workbench tool
SFFScene File Format
SFIGraphicsSIS Framegrabber
SFIPrinter font (HP LaserJet landscape)Ventura Publisher
SFLPCL 4 bitmap font (landscape)landscape - Intellifont - Ventura Publisher
SFLSound fileSound Forge and ACID Pro
SFNFontSPX
SFOBitstream font file - fontware format
SFPPCL 4 bitmap fontportrait - Intellifont - Ventura Publisher
SFRSonic Foundry Sample ResourceAWAVE
SFSPCL 5 scalable font fileIntellifont
SFTScreen fontChiWriter
SFVSimple file verification checksum filemany file verification tools
SFXRenamed dBASE III screen mask filedBASE IV
SFXSFX (self-extracting archives) scriptRAR
SG1GraphicsStanford Graphics
SGFDocument with graphicsStarwriter
SGFSmart Game FormatMany board games
SGIGraphics fileIRIS - Silicon Graphics
SGPStatisticsSTATGRAPHICS Plus
SGTSave/get keyboard macroSignature
SHASCII archiveSHAR
SHUnix shell scriptUnix shell interpreter
SH3PresentationHarvard Graphics 3.0
SH3DSweet home 3d fileSweet home 3d
SHA1SHA1 Checksum verification FileHashCheck (Windows)
SHARArchiveUNSHAR (Unix)
SHBBackgroundCorelShow
SHGSegmented Hyper GraphicsMicrosoft's shed.exe, JGsoft's Hotspot Builder, EC Software's Help and Manual
SHKApple II archiveSHRINKIT
SHMShell macroWordPerfect Library
SHPShape file and source file for text fontsAutoCAD
SHPESRI shapefileArcGIS
SHRsee SHAR
SHTHTML format for WWWNetScape
SHWPresentationHarvard Graphics 2.0 - CorelShow
SHWSlide showWordPerfect Presentations, PMview Slide Show
SHXShape entitiesAutoCAD
SHXESRI shapefileArcGIS
SIBSibelius fileSibelius 1-5
SIDSound Interface Device file formatSIDplayer, SIDplay, sidplay2 /w
SIFSetup Installation Files infoWindows NT Setup
SIGCurrent program settingsSignature
SIGSignature fileThunderByte AntiVirus - PopMail
SIKBackup file (Sicherungskopie)Microsoft Word
SIMSimon document file - Simon instruction software editor
SISsymbian file
SITArchive (Macintosh)STUFFIT
SKI ? ?
SKPGoogle SketchUp file
SKYSYLK Spreadsheet file (used by Multiplan)
SLS-Lang source code file
SLBP-CAD library (symbols)P-CAD
SLBSlide libraryAutoCAD
SLCSALT (script from Telix) compiled codeTelix
SLDSlideAutoCAD
SLDPRTPartSolidWorks
SLDASMAssemblySolidWorks
SLDDRWDrawingSolidWorks
SLISlideMAGICorp Slide Service
SLKMicrosoft Excel import formatMicrosoft Excel
SLKSYLK Symbolic Link format data fileMultiPlan
SLLSound data file
SLLStatic Link LibraryPowerBASIC
SLNMicrosoft Visual Studio SolutionMicrosoft Visual Studio
SLPSLP command file created by SRCCOMRT-11
SLPLocalization project fileSisulizer
SLTSALT Script Application Language for Telix script sourceTelix
SLVSolution for any gamemany
SMMaillistSoftSpoken Mailer
SMScriptScriptMaker
SMSMALLTALK source code file
SMText fileSamna Word
SMStepMania Step FileStepMania
SMCSuper MagiCom SNES ROM imageSuper MagiCom
SMCLVLSecret Maryo Chronicles LevelSecret Maryo Chronicles
SMFFaxSMARTFAX
SMF3D World Studio mesh files
SMKSmacker Video Format (RAD Video)
SMLSystem Macro LibraryRT-11
SMMAmi Pro Macro FileAmi Pro
SMNFont (ParaGraph's WorkScript format)
SMPSample (sound file)
SMPSamplevision FileSamplevision
SMPLDataMegahedron 3D object
SMSMSTS Sound management system fileMSTS
SMTText fileSmart Ware II
SNCompressed song fileSound Club editor
SNDDigitized sound fileMacintosh/ATARI/PC
SNDPower Chords drum sound filePower Chord
SNDBSQLNotes databaseSQLNotes
SNGSong (midi sound)Midisoft Studio - Prism
SNGSaved game file for StarCraftStarCraft
SNOSNOBOL4 source code file
SNPBook-shelf for .BOOREADIBM
SNPMicrosoft Access report snapshot
SNPOutput video format from Computer Eyes equipment
SNXSaved game file for StarCraft: Brood WarStarCraft: Brood War
SOshared object, dynamically linked libraryUnix, Linux
SOARSoar Production file
SOFAltera FPGA programming file (internal RAM)Altera Quartus
SOLSolution e.g. game walkthroughs
SOLAdobe Flash shared object ("Flash cookie") (Movie, film, video and multimedia file type)Adobe Flash
SOMNetwork serial numbersQuattro Pro
SOMSort informationParadox
SONSongSBStudio II
SOUTemporary BATCH fileRT-11
SOUSBStudio II Sound FileSBStudio II
SOUSound data (sound tool)
SPArchive (unix)SPLINT
SPCProgramMicrosoft Multiplan
SPCTemporary fileWordPerfect for Win
SPCSNES SPC-700 Sound FileSNES games
SPCSpectroscopic data (scientific)Thermo Scientific
SPDScalable fontSpeedo - Harvard Graphics 3.0
SPFSlide presentation fileEnerGraphics
SPFdataSQR Portable Format
SPGGlossarySprint
SPIGraphics (Siemens and Philips scanner)
SPIFFStill Picture Interchange File Format
SPINSpin source fileParallax Propeller Microcontrollers
SPLArchiveSPLINT
SPLCustomized printer driverSprint
SPLDivided file segmentSlice
SPLPersonal spell dictionarySignature
SPLPrint spooling fileWindows 3.x
SPLSample
SPMData wp{wp}.spmWordPerfect
SPPPrinter fileSprint
SPRDocument letterSprint
SPRGenerated executable screen fileFoxPro
SPRSprite
SPRStory Board sprites
SPSExported SyncBack profileSyncBack
SPSScreen driverSprint
SPSSPSSx source code fileVAX/VMS
SPTData support file (MITAC disk/system management utility pack)MITAC disk/system management utility pack
SPTSPITBOL source code file
SPWWorksheetSigmaPlot
SPXCompiled executable screen fileFoxPro
SPXOgg Speex bitstream[1]Xiph.Org Foundation
SQDSquish message baseSquish
SQISquish message base indexSquish
SQLStructured Query LanguageAny SQL database
SQLiteSQLiteFirefox SQLiteBrowser
SQLSquish message base lastread pointersSquish
SQMWindows Live Messenger log file
SQNNote fileSquareNote
SQZArchiveSQUEEZE
SQZFOXPRO Squeeze fileFOXPRO
SRCSource codeAurora Compiler
SRCMulti-edit sourceMulti-Edit
SRCSourceDataFlex
SRFSun Raster File graphics file
SRPScriptQuickLink
SRTSubtitle formatSubRip
SSBitmap graphicsSplash
SSScreen saverDN
SSCCelestia Solar System Catalog fileCelestia
SSDDatafileSAS/PC
SSFGraphic fileSnagIt Studio File/PC
SSGSaved gameSimsig
SSIFStereoscopic Interleaved fileMedia playback devices / software that supports Blu-ray 3D
SSPDatafileSAS Transport
SSRFLEXIT Singleshot Survey Raw Data fileFLEXIT
SSTAVHRR graphic file
SSVSpreadsheet viewer file
STInstrument libraryScream Tracker
STSMALLTALK source code fileLittle Smalltalk
STStampNeoPaint
STAData fileStatistica
STASaved stateReflection 4.0
STAStackSpinmaker Plus
STBSymbol table fileRT-11
STBStub libraryGenus GX Kernel
STCCelestia Star Catalog fileCelestia
STCOpenOffice.org XML spreadsheet templateOpenOffice.org Calc
STDState Transition Diagram graphic fileProsa
STDOpenOffice.org XML drawing templateOpenOffice.org Draw
STEAMSTARTSTEAMSTART fileSteam (software)
STFArchiveSHRINKTOFIT
STFSetup Table File
STIOpenOffice.org XML presentation templateOpenOffice.org Impress
STKeBookStarebook
STLStereolithography Interface Format
STLSubtitle files EBU-standard
STMMusic format (4 channels) (Scream Tracker Module)ST - DMP
STMState Transition Diagram model fileProsa
STOPascal stub OBJ fileGenus GX Kernel
STPSubtitler ProjectBelle Nuit Subtitler
STRGate3 table structure file
STRStructure list object filedBASE Application Generator
STRPlayStation video file
STSMusic format (Scream Tracker Song)ST 2.0-2.3
STSProject status infoMicrosoft C/C++
STUStudio ProjectPinnacle Studio (video editing software)
STUFFEVE Online compressed file archiveCCP hf
STWData fileSmartTerm for Windows
STWOpenOffice.org XML text document templateOpenOffice.org Writer
STXElectronic bookSmarText
STXMusic format
STXTax formCA-Simply Tax
STYAmi Pro Template (Style); used by other programs for `styles`Ami Pro
STYStyle library or sheetmany
SUSaurus source file
SU?Packed mailFTN software
SUBSubtitle formatSubViewer; Author David Dolinski
SUCSaurus byte-code fileSaurus VM
SUFSony camera configuration file (setup.suf)XDCAM-EX camcorders
SUISUIT librarySimple User Interface Toolkit
SUMSummary
SUNSun rasterfile graphics fileSun Microsystems
SUOSolution User OptionsMicrosoft Visual Studio
SUPSubtitle file (Blu-ray encapsulated container)SupRip
SUPSupplementary dictionaryWordPerfect for Win
SURSurface topography (in native "SURF" format)MountainsMap
SV4Saved Game FileRollerCoaster Tycoon
SV6Saved Game FileRollerCoaster Tycoon 2
SVCRepresents the ServiceHost instance hosted by Internet Information ServicesWindows Communication Foundation
SVDAutosave file for documentMicrosoft Word
SVGAutosave file for glossaryMicrosoft Word
SVGScalable Vector Graphicsmany
SVQMRC-Pro sequencers music formatRoland Corporation synths such as XP or Fantom series
SVSAutosave file for style sheetMicrosoft Word
SVWSuper Video WindowsConversion Artist
SVXInterchange, 8SVX/16SVAWAVE
SVYFLEXIT Survey dataFLEXIT
SWRaw Signed Word (16bit) dataAWAVE
SWFShockwave FlashMacromedia
SWGSWIG source codeSWIG
SWGSWAG Pascal Snippets fileSWAG
SWPDocument backupSprint
SWPSwap file
SWTHump Routes FileFYM
SXCOpenOffice.org XML spreadsheetOpenOffice.org Calc
SXDOpenOffice.org XML drawingOpenOffice.org Draw
SXGOpenOffice.org XML master document
SXIOpenOffice.org XML presentationOpenOffice.org Impress
SXMOpenOffice.org XML formulaOpenOffice.org Calc
SXP3DS Process file3D Studio
SXWOpenOffice.org XML text documentOpenOffice.org Writer
SY1SmartPix symbol libraryAmi Pro
SY3Harvard Graphics format
SY3Symbol fileHarvard Graphics 3.0
SYDBackup of startup files created by QEMM (?) autoexec.syd
SYDSysedit backup fileSysedit
SYGMonitor and handler files created by SYSGENRT-11
SYMCompiler symbolic information file
SYMP-CAD component (symbols)P-CAD
SYMPrecompiled headersBorland C++
SYMProgram symbol tablePower C, Microsoft ILink incremental linker
SYMSymbol fileHarvard Graphics 2.0, Microsoft Windows SDK
SYNSDSC Synu image fileSDSC Image Tool
SYNSynonym fileMicrosoft Word 5
SYSDatafileSYGRAPH - SYSTAT - SPSS/PC
SYSSystem file - device driver or hardware configuration infoDOS
SYWGraphics file (symbol)Harvard Graphics Win
SYWYamaha SY-85/SY-99 Wave FileConvert (c) Villena
SZPROJSZInstallSystem ProjectSoftwareZator 2011 Standart Edition
T
TArchive without compression (tape)tar
TTADS source
TTester symbol tableReaGeniX code generator
T?HTurbo Help file (Pascal, C, Assembler, ...)Borland Thelp
T$MAVG scan log files[2]AVG
T2BBookeen Cybook thumbnailCybook
t2flowTaverna 2 workflow definitionTaverna workbench
T2LTrue2Life file format3D Internet content developers
T44Temporary file for Sort or IndexdBASE IV
T64ProgramC64S emulator
TAGQuery tag nameDataFlex
TAHHelp file for Turbo AssemblerBorland C++
TAKAudio codec, Lossless audio file formatWinamp (+Plugin), foobar2000 (+Plugin), Media Player Classic - BE
TALAdobe Type AlignAdobe
TALText illustrationTypeAlign
TAPTape fileZX Spectrum emulator by g.a.lunter
TARArchiveTAR
TAZArchiveWinZipNT - TAR - COMPRESS
TBTab file (Virtual Desktop Tab)Tabbery
TB1Font fileBorland Turbo C
TB2Font fileBorland Turbo C
TBFFaxImavox TurboFax
TBKFOXPRO template backup fileFOXPRO
TBKMemo backupdBASE IV - FoxPro
TBKToolbookAsymetrix ToolBook
TBLShort for Tableused by many programs
TBLAldus TableEditor fileTableEditor
TBLGate3 table file
TBLGraphics file (native format)PageMaker TableEditor
TBLTable of valuesOS/2
TBRNorton Desktop custom toolbarNDW
TBSText elements ?? (Textbausteine)Microsoft Word
TBXTableProject Scheduler 4 - TermBase eXchange (ISO 30042)
TBZArchiveWinZipNT - TAR - Bzip2
TCConfigurationTurbo C - Borland C++
TCHHelp fileTurbo C - Borland C++
TCLTool Command Language source codeSwat
TCTDrawing TemplateTurboCAD for Windows
TCWNative Drawing FileTurboCAD for Windows
TDConfig from Turbo DebuggerTurbo Debugger
TD0Compressed disk image fileTeledisk
TD1Multi-part disk image fileTeledisk
TD2Configuration fileTurbo Debugger for Win32
TDBDatabaseTACT
TDDDImagine Object File FormatImagine
TDFSpeedo font file
TDFTypeface definition fileSpeedo
TDHHelp file for Turbo DebuggerBorland C++
TDKKeystroke recording fileTurbo Debugger
TDRContens of Arvid tape
TDSSymbol tableTurbo Debugger
TDTThumbnail dataAVCHD
TDWConfiguration fileTurbo Debugger for Windows
TECDataTECPLOT output
TECTECO macro file ("compiled" form)TECO
TEFFaxRelisys TEFAX
TELHost fileTelnet
TEMInput templateIconAuthor
TEMTurbo Editor Macro Language scriptBorland C++
TERMTerminal File
TESTECO macro file (source form)TECO
TETTetris resultsDN
TEXDatasheetIdealist
TEXTeX text fileScientific Word - TeX
TEXImageSlimtex
TEXTText file
TFConfigurationTurbo Profiler
TFAArea fileTurbo Profiler
TFCCatalogue fileTobi's Floppy Cataloguer
TFFself executing TansForm dialogueTansForm
TFHHelp file for Turbo ProfilerBorland C++
TFMTagged font metric fileIntellifont
TFMTeX Font Metric fileTeX
TFSStatistical informationTurbo Profiler
TG1Project fileOn Target
TGATarga bitmapPaint.NET, many raster graphics editors
TGZArchiveWinZipNT - TAR - GNUzip
TH?Packed mailFTN software
THEWindows'95 Desktop ThemeMicrosoft Plus
THMThumbnail or Theme FilePicture Publisher, PhotoMagic, Canon Digital Cameras, and Sony Digital Cameras create these Thumbnail files; also used for Sony Ericsson Theme File, for a cell phone
THPNintendo proprietary video formatVarious Nintendo games
THRThredWorks Embroidery FormatThred, Embroidermodder
THSThesaurus dictionaryWordPerfect for Win
TIBAcronis True Image BackupAcronis True Image
TICFTN special file with assotiated file descriptionALLFIX
TIFsee TIFF
TIFFTIFF (tagged image format file) bitmapped fileAlchemy - PhotoStyler -PageMaker - CorelDRAW
TIGERTomb Raider binaries filesUbi
TILFuzzy logic knowledge baseTogai InfraLogic Fuzzy-C Compiler
TIPDigital Signage PresentationTru-Designer, Tru-Player, Tru-Scheduler part of Tru-i Suite[3]
TISTile setMahJongg 3.0
TJLBackup fileVAXTPU editor
TLBReference tableBubble Chamber
TLBText libraryVAX
TLBType library [1]A binary file with information about a COM or DCOM object so other applications can use it at runtime. Created by Visual C++ or Visual Studio. Used by many Windows applications.
TLCCompiled Tool Command Language source codeSwat
TLDDisk ImageTeledisk
TLGTransaction LogIntuit QuickBooks
TLHTypelib Generated C/C++ HeaderVisual C++
TLPProjectTimeLine
TLXWebsite builderTrellix
TM2Typical Meteorological Year data (new)Typical Meteorological Year
TMFTagged Font Metric fileWordPerfect for Win
TMFTiVo movieTiVo
TMOZTG global optimizer default output fileZortech C++
TMOHandsHigh ThoughtManager OutlineThoughtManager Desktop
TMPTemporary file(Several programs)
TMSTeleMate compiled scriptTeleMate
TMYTypical Meteorological Year data (old)Typical Meteorological Year
TMY2Typical Meteorological Year data (new)Typical Meteorological Year
TOCTable Of Contents text file (ASCII)
TOCGTorgaNET Diplomatic CablesState Department of Torga
TOKBorland C++ 4.x reserved word listBCW.EXE
TOGTorgaNETTorgaNET database file
TOPCTopicCrunch SEO Project file holding keywords, domain and search engine settings (ASCII)
TORRENTTORRENT FileBitTorrent clients (various)
TOSCharacter fileThe Only Sheet
TOSSelf-extracting file archive (Atari ST)
TPSession-state fileTurbo Profiler
TPTurbo Pascal cfg fileTurbo Pascal
TPTinkerPlots DocumentTinkerPlots and Fathom Dynamic Data Software; documents contain data tables, graphs, text, pictures, etc.
TP3TemplateHarvard Graphics 3.0
TPBDownloadable PCL Soft font file backupHiJaak
TPCFile produced when an inter-Topicscape topic link file is exported to Windows3D Topicscape
TPFDownloadable PCL Soft font fileHiJaak
TPFPrint data in EMF formatThinPrint
TPHHelp fileTurbo Pascal
TPLResident units libraryTurbo Pascal
TPLTemplate fileGoldEd -ITrack
TPLTemplateHarvard Graphics 2.0
TPOLYDataTPOLY 3D object
TPPProtected Mode UnitsBorland Pascal 7.0
TPTDigital Signage Presentation TemplateTru-Designer, Tru-Scheduler part of Tru-i Suite[3]
TPUBorland Pascal DOS Mode LibraryBorland Pascal
TPUCommand file (VAXTPU editor)VAXTPU editor
TPWBorland Pascal Windows LibraryBorland Pascal
TPWSession-state fileTurbo Profiler for Windows
TPZArchiveTAR - GNUzip
TRMan page input suitable for troff -mancawf2.zip
TRSession-state settingsTurbo Debugger for DOS
TR2Session-state settingsTurbo Debugger for Win32
TRCDebug support filePower CTrace
TRASHFile found during a file scan as buggedWindows
TREDirectory tree filePC-Tools
TRDDatafileTrID file identifier filetypes definitions package
TRIADataGreg Hood's ASCII Triangle
TRIBDataGreg Hood's Binary Triangle
TRIFTiled Raster Interchange Format
TRKTrack (i.e. video sequence), used by many games
TRMTerminal settingsWindows 3.x
TRNTranslation support fileQuattro - Clarion
TRSExecutable fileMicrografx or password file
TRSWiSo Mein Geld 2007
TRSIBM Mainframe log fileTRSMAIN
TRUTrue Basic source file
TRWSession-state settingsTurbo Debugger for Windows
TRYTypical Meteorological Year data (variant)TRNSYS
TSMPEG Transport StreamVarious media players / software
TSQt Linguist TS FileTrolltech Qt Linguist
TSTypeScript source file
TSEDataLight Map Maker ASCII Scene
TSKMicrosoft Multimedia Task ApplicationWin95
TSLExported ScheduleTru-Scheduler part of Tru-i Suite
TSMTurbo Assembler ManualTASM for OS/2
TSTPrinter test fileWordPerfect for Win
TSVTab Separated Values
TTFTrueType Font file
TU?Packed mailFTN software
TUDThe Ultimate Draw fileThe Ultimate Draw
TUTTutorial
TVTable view settingsParadox
TVFTable view settingsdBASE
TVnOverflow file above insert point in Doc nWordPerfect for Win
TWFWarp Map FileGeo Semiconductor, Inc eWarp Pro Development Took Kit
TXCTest Configuration Format
TXFTax eXchange Format
TXISupport fileTeX
TXTCommon name for ASCII text file
TXTTab-Delimited Text FileMicrosoft Excel
TXTDocument ExtensionTextEdit
TXWYamaha TX-16W Wave FileConvert (c) Villena
TYTiVo movieTiVo
TYMTime Stamp (PageMaker 4)PageMaker 4
TZArchiveTAR - COMPRESS
TZBArchiveTAR - COMPRESS - BTOA
TZLTanzzle pattern fileTanzzle
TZXTanzzle image fileTanzzle
U
U3DModel file formatUltimate 3D
U3DUniversal 3DAdobe Acrobat
U8Sample
UBRaw Unsigned Byte (8bit) dataAWAVE
UC2ArchiveUC II
UCNNew archiveUC II
UCSUnknownsoft Service Pack (mainly for Shadow OS 2009)Unknownsoft Computer Systems
UDFFilterAldus Photostyler
UDODataMoray User Defined Object
UDIWWWbookmark dataUdiWWW
UDWRaw Unsigned DWord dataAWAVE
UE2Encrypted archiveUC II
UFIdataUFO CaptureV2 settings -
UFOgraphic fileUlead Photo Impact
UHAUHarc archive
UHSUniversal Hint System (binary file)
UIEspire source code fileGeoworks UI Compiler Geos
UIQt Designer's UI FileTrolltech Qt Designer
UIUser interfaceSprint
UIFLong prompts for windowsWordPerfect for Win
UIHEspire header fileGeoworks UI Compiler Geos
ULULAW audio file
ULDInformation about uploaded filesProcomm Plus - Datastorm Technologies, Inc.
ULFdataMRF Mapping Tool Kit Universal List Format
ULTMusicUltraTracker
UMBBackup fileMemMaker
UMPUmple UML Programming Language FormatUmple
UMXUnreal Music PackageUnreal Tournament
UNFUniversal NES Image Interchange File Format
UNIDatafileForecast Pro
UNIMusic formatUNIMOD - MIKMOD
UNIFUniversal NES Image Interchange File Format
UNVText file containing finite elements nodal coordinates and more See notesOriginally used by SDRC for its I-deas software; a lot of simulation software use it today
UNXText file containing UNIX specific info
UOMLUniqueObject Markup Language (UOML) is a XML-based markup language
UOPUniform Office Format presentation
UOSUniform Office Format spreadsheet
UOTUniform Office Format text
UPDUpdate datadBASE
UPOCompiled update datadBASE
URLInternet Shortcut (URL)Windows Explorer
URTUtah Raster Toolkit
USELog file
USPPrinter font with USASCII extended character setAdobe PageMaker
USRUser database fileProcomm Plus - Turbo C++ tour
USTUTAU vocal trackUTAU
UT!datafileuTorrent
UTZMobile Phone ThemeSony Ericsson
UUEncoded file (ASCII)UUENCODE/UUDECODE - Uuencoding
UUEEncoded file (ASCII)UUENCODE/UUDECODE - Uuencoding
UWRaw Unsigned Word 16bit dataAWAVE
UWFUltraTracker WaveSampleUltraTracker
V
VConsistency check support fileReaGeniX code generator
VMain input file for an imageVivid 2.0
VCoq source file
VVerilog source file
V1, V2, ...Split parts of a whole fileJJSplit
V8Covox 8bit fileAWAVE
V10DataGouraud Shaded Vectors
V2DVoucher design fileVoucher management included in JFire (e.g. when printing a voucher)
VAImultimediaPhotoDub document
VALValidity checks and referential integrityParadox for Windows
VALValues list object filedBASE Application Generator
VALASourcecodeVala
VANAnimationVistaPro
VAPValue Added ProcessNetWare 2.xx
VAPDialogic indexed adpcm voice fileVBASE/40
VARVariable fileIconAuthor
VBVisual Basic .Net source fileVisual Basic .NET
VBPROJVisual Basic .Net project fileVisual Basic .Net Express and Visual Studio 2003-2010 Project
VBRVisual Basic Custom Control fileVisual Basic
VBSVBScript script fileVBScript
VBXVisual Basic eXtensionVisual Basic
VBZVisual Basic Setup Wizard TemplateSetup Wizard
VC6Graphite - 2D and 3D draftingAshlar-Vellum
VCInclude file with color definitionsVivid 2.0
VCSpreadsheetVisiCalc
VCAVisual Clip Art
VCDVideoCD
VCDVirtualDrive CD Image File
VCDValue Change Dump (Verilog) temporal database file
VCDVisualCADD Drawing File
VCEVisual CertExam FileVCE Exam Simulator
VCLSVocaListener voice scanner fileVocaListener Plug-in (Vocaloid3)
VCRVCR drivers for Arvid
VCWVisual workbench informationMicrosoft Visual C++
VCXSpreatsheetVisiCalc Advanced
VDATarga bitmap graphicsmany raster graphics editors
VDIVirtual Disk ImageVirtualBox
VDOStory Board video imageStory Board
VDRDrawingComputerEasy Draw
VEGVegas ProjectSony Vegas
VEWGroupWise for WindowsWin
VEWView fileClipper 5 - Lotus Approach
VF0Database fileOTExpert 5
VFAFontLab Database fileFontLab
VFDVirtual Floppy DiskWindows Virtual PC (among others)
VFMVentura Font Metrics file
VFMVoting FormVoter
VFNVoting Form for CustomersVoter
VGAVGA display driver
VGAVGA display font
VGDVGA display driverGeneric CADD
VGMVideo Game Music audio format
VGRGraphics fileVentura Publisher
VHDVirtual Hard DiskWindows Virtual PC (among others)
VILabVIEW Virtual InstrumentLabVIEW
VIGraphics fileJovian Logic VI
VIWatcom editor scriptVI.EXE
VIAVIA Document ProjectVIA Text Editor
VICsee VICAR
VICARGraphics (Video Image Communication and Retrieval)
VIDBitmap graphics (YUV12C M-Motion Frame Buffer)
VIDGraphics formatWord&Deed
VIDMS-DOS Shell Monitor fileMS-DOS 5
VIDScreen device driverWord
VIFsee VIFF
VIFFKhoros Visualization Image File FormatSDSC Image Tool
VIKGraphics format (VIKING)
VIMVim script fileVim text editor
VINFdataReMPEG log file - frames info
VIRVirus or infected file
VISVIS graphics file
VLMVellum, Vellum 2D, Vellum Draft, Vellum 3D, DrawingBoardAshlar-Vellum
VLMVirtual Loadable ModuleNetware
VMVirtual Memory fileGeoworks
VMCVirtual memory configurationDOS/4GW PM 32X DOS Extender
VMDKVirtual Disk fileVMware
VMFFont characteristicsVentura Publisher
VMGNokia message file formatText Message Editor (Nokia PC Suite)
VMSText file containing VMS specific info
VMTSource Engine resource fileSource Engine
VOInclude file with object definitionVivid 2.0
VOBVideo ObjectDVD-R, DVD-RW
VOCSound format (Creative Lab's Sound File)PlayVoc
VOFObject folderVZ Programmer
VOPVisual Orangator Project
VOPVisual OTTHYMO Project
VOXDialogic adpcm fileAWAVE, CoolEdit
VP3DS Video posting3D Studio
VPFVector Product Format
VPGGraphics fileVPGraphics
VPHVirtual Pascal HelpVP/OS2
VPIVirtual Pascal UnitVP/OS2
VPMGarmin Voice Processing Module
VPPVisual Paradigm ProjectVisual Paradigm for UML
VQAVector Quantized AnimationThe Legend of Kyrandia
VQMHardware description languageAltera
VRMOverlay fileQuattroPro
VRMVisual rexx sourceWATCOM VREXX
VRMLVirtual Reality Modeling LanguageNetScape
VRPProjectWATCOM VX?Rexx
VRSVideo Resource e.g. video device driverWordPerfect
VSVellum SolidsAshlar-Vellum
VSInclude file with surface definitionVivid 2.0
VSDDiagramShapeware Visio
VSDVisio drawingVisio
VSMVisual Simulation ModelVisSim
VSPSpriteSPX
VSQVocal synthesizer track dataVocaloid2, Vocaloid3
VSQXVocal synthesizer track dataVocaloid3
VSSSmartShapes fileShapeware Visio
VSSVisio TemplateVisio
VSTTruevision Vista graphicsmany raster graphics editors
VSTVisio TemplateVisio
VSTOMicrosoft Office add-in fileMicrosoft Visual Studio
VTFSource Engine resource fileSource Engine
VUEAnimation3D Studio
VUEViewdBASE IV - FoxPro
VWText fileVolksWriter
VWRFile viewer filePC Tools
VWXCAD FileVectorWorks 2008
VXDWindows 3.x virtual device driverWindows 3.x
VZTTemporal database fileGTKWave data file
W
WWord chart fileAPPLAUSE
W01Yamaha SY-series wave filesAWAVE
W01Yamaha TX16W wave fileAWAVE
W30Printer fontAST TurboLaser - Ventura Publisher
W31Startup fileWindows 3.1
W3AWarcraft III Abilities Export FileContained in a Warcraft III map
W3BWarcraft III Destructables Export FileContained in a Warcraft III map
W3DWarcraft III Doodads Export FileContained in a Warcraft III map
W3DWestwood 3D object format3D models used in Renegade and Generals
W3DShockwave 3D object format
W3GWarcraft III Replay FileFile for Warcraft III
W3HWarcraft III Buffs Export FileContained in a Warcraft III map
W3MWarcraft III MapFile for Warcraft III: Reign of Chaos
W3NWarcraft III CampaignFile for Warcraft III: The Frozen Throne
W3OWarcraft III Object Data Export FileContained in a Warcraft III map
W3PWarcraft III SaveSave File for Warcraft III
W3QWarcraft III Upgrades Export FileContained in a Warcraft III map
W3TWarcraft III Item Export FileContained in a Warcraft III map
W3UWarcraft III Unit Export FileContained in a Warcraft III map
W3VWarcraft III SaveSave File for Warcraft III
W3XWarcraft III Expansion MapFile for Warcraft III: The Frozen Throne
W3ZWarcraft III SaveSave File for Warcraft III
W40renamed system files (AUTOEXEC.BAT, COMMAND.COM, CONFIG.SYS,DBLSPACE.BIN.DRVSPACE.BIN,MSDOS.SYS) of Windows versionWindows 95, 98, ME (dual-boot feature)
W44Temporary file for Sort or IndexdBASE
W95Something for Windows95Win95
WADWhere's All the Data?Doom - Doom2
WADNintendo proprietary format for Wii channels, menus, etc.Nintendo Wii
WAGYard Contents FileFYM
WAIWarcraft III AI Data FileWarcraft III AI Data File
WARJava Web ArchiveA Java file format used to package and deploy web applications
WASProComm Script File (source code)ProComm
WAVSound format (Microsoft Windows RIFF WAVE)Media Player
WAXTVTonic WAX video packagingWavexpress TVTonic
WAXProComm compiled scriptProComm
WAXWindows Media Audio ShortcutWindows Media Player (Windows Media Audio Redirector)[4]
WB1NotebookQuattro Pro
WB2SpreadsheetQuattro Pro
WBFMicrosoft Windows Batch FileCatch
WBKDocument/workbook or Microsoft Word backup fileWordPerfect for Win or Microsoft Word
WBTNorton DesktopNorton Desktop
WBTWilsonware Batch fileWinbatch
WCDCondes Event Data fileCondes
WCDMacro token listWordPerfect for Win
WCHWordPerfect Macro FacilityWP
WCMData transmission fileMicrosoft Works
WCMMacroWordPerfect for Win
WCPProduct information descriptionWordPerfect for Win
WDInfoSelect Data file
WDBDatabaseMicrosoft Works
WDMAdmin tool connection definitionWar FTP
WE?Packed mailFTN software
WEBWEB source code fileWeb Easy Professional
WebOOGLWeb Object Oriented Graphics Library
WFBTurtle Beach WaveFront BankAWAVE
WFDTurtle Beach WaveFront DrumAWAVE
WFMForm objectdBASE Form Designer
WFNFontCorelDRAW
WFPTurtle Beach WaveFront Prog.AWAVE
WFTWeb Family TreeGRAMPS
WFXData fileWinfax
WG1WorksheetLotus 1-2-3/G
WG2WorksheetLotus 1-2-3 for OS/2
WIDWidth tableVentura Publisher
WIFITorga OS Wifi Settings Database14th Information Division (Torga)
WIKIWiki markup (various flavors)Wikis
WIMWindows Imaging FormatImageX
WINWindow fileFoxPro - dBASE
WIREFRAMEDataEMSE mesh
WIXWindows Installer XMLWiX
WIZPage wizardMicrosoft Publisher
WK1SpreadsheetLotus 1-2-3 version 2.x - Lotus Symphony 1.1+
WK3SpreadsheetLotus 1-2-3 version 3.x
WK4SpreadsheetLotus 1-2-3 version 3.4
WKBDocumentWordPerfect for Win
WKESpreadsheetLotus 1-2-3 educational version
WKFVISI Working fileVero Software
WKISpreadsheet formatLotus 123 2x
WKQSpreadsheetQuattro
WKSSpreadsheetLotus 1-2-3 version 1A - Lotus Symphony 1.0, Microsoft Works
WKSWorkspaceXlisp
WKZSpreadsheet formatDos Navigator
WLKGraphicsVirtus Walkthrough
WLKWalk Through for any gamemany
WMAWindows Media Audio audio file
WMCBackup of startup files by Windows MathCad autoexec.wmcMathCad
WMCMacro fileWordPerfect for Win
WMCText fileWordMARC
WMDBWindows Media Player databaseWindows Media Player
WMFWindows MetaFile vector graphics
WMOWoW Map ObjectBlizzard Entertainment games (World of Warcraft/Warcraft series)
WMPGraphics (Windows Magic Icon Palette)
WMVWindows Media Video video file
WNTextNeXT WriteNow
WNFCorel Draw Font FileCorelDraw
WOASwap fileWindows 3.x
WOCOrganizationWindows OrgChart
WOWMusic (8 channels)Grave Mod Player
WPWord Perfect FormatWP
WP5DocumentWordPerfect 5.x
WPDDocumentWordPerfect 6.0 - PFS:WindowWorks
WPDWindows printer driver (uninstallable)Windows
WPFFaxWorldPort
WPFFormWordPerfect
WPGWordPerfect Graphics vector graphicsDrawPerfect
WPJWatcom C/C++ IDE projectIDE.EXE
WPKMacrosWordPerfect for Win
WPLMediaRack Wave PlaylistMediaRack
WPLWindows Media PlaylistWindows Media Player
WPMMacrosWordPerfect
WPSText documentMicrosoft Works
WQ!Compressed spreadsheetQuattro Pro
WQ1SpreadsheetQuattro Pro
WR1SpreatsheetLotus Symphony 1.1 - 1.2 - 2
WRDTemplateCharisma
WRIWrite editor formatWrite - WinWord
WRKSpreadsheetLotus Symphony 1.0
WRLVRML file
WRPArchiveAmiga WARP
WRSWindows Resource e.g. might indicate error if word cannot openWordPerfect for Win
WSAPL Worksheet
WSText fileWordStar 5.0-6.0
WS2Text fileWordStar 2000
WSDDocumentWordStar
WSFWindows Script FileMicrosoft Windows Script Host
WSPWorkspaceFortran PowerStation
WSQWavelet-packet Scalar Quantization Format
WSRCX-wais source
WSTText fileWordStar
WTRWorking Timetable rules fileSimsig
WTTWorking Timetable timings fileSimsig
WTFWorld of Warcraft Data FileWorld of Warcraft
WTFWinTaper Data
WWBButton bar for document windowWordPerfect for Win
WWFWWF Document Format
WWKKeyboard layoutWordPerfect for Win
WXHProgram/Script FileWaxHtml Web Programming Language
WXPDocumentEXP for Windows
WZWizet game archive fileWizet/Nexon MapleStory
WZAEncrypted archive fileDepartment of Defense Encryption Wizard (Public Edition)
X
XArchiveX1.EXE
XAVS X image fileSDSC Image Tool
XDirectX 3D object
XLEX source code file
XXBasic Source code fileXbasic
X3Dx3d and xdart Formats
XAXA audio fileused in SimCity 3000 by Maxis, also by Sony PlayStation
XARXara graphics fileFiles created by Xara Photo & Graphic Designer (formerly Xara Xtreme and Xara Studio); early versions used the extension ART
XBEXbox ExecutableXbox
XBMX11 Bitmap graphics file
XLBLextensible Business Reporting LanguageBusiness Reporting
XCFGimp image fileThe Gimp
XCKExtended crack file (usually text)
XCLXtree for Windows Script fileXtree for Win
XDFOS/2 extended disk format imageXDFCOPY.EXE
XDMDirectory Manipulator for 32-bit Protected ModeXenotech Research Labs
XEXenon - for Associative 3D ModelingAshlar-Vellum
XEXXbox 360 Executable File
XFNPrinter fontXerox 4045 - Ventura Publisher
XFRVentura Publisher Bitmap Editor Font file
XFT24 pin printer fontChiWriter
XIFast Tracker 2 instrument fileAWAVE
XIFastracker 2.0 Instrument FileFastracker 2.0
XIFXerox Image FormatPagis Pro 2.0 and 3.0
XLAAdd-in macro sheetMicrosoft Excel
XLAXLib Archivexlibpas2.zip
XLBMicrosoft Excel ToolbarMicrosoft Excel
XLCMicrosoft Excel ChartMicrosoft Excel
XLDMicrosoft Excel DialogMicrosoft Excel
XLFExtensible LADAR FormatLadarSIM
XLKMicrosoft Excel ArchiveMicrosoft Excel
XLLMicrosoft Excel Dynamic Link LibraryMicrosoft Excel
XLMMicrosoft Excel Macro FileMicrosoft Excel
XLSMicrosoft Excel SpreadsheetMicrosoft Excel
XLSBMicrosoft Excel 2007 Binary Workbook (BIFF12)(Spreadsheets)Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLSMMicrosoft Excel 2007 Macro-Enabled Workbook (Spreadsheets)Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLSXOffice Open XML Workbook (Spreadsheets)Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLTMicrosoft Excel TemplateMicrosoft Excel
XLTTranslation tableLotus 1-2-3 - Symphony - Procomm Plus
XLVMicrosoft Excel ModuleMicrosoft Excel
XLWMicrosoft Excel WorkbookMicrosoft Excel
XMFast Tracker 2 extended moduleAWAVE, Mod4Win, FastTracker, ImpulseTracker
XMMusic formatFastTracker - Cubic Player
XMCAssisted contact lists file format, based on xml and used in kindergartens and schoolsClassmates iPhone app
XMODMonarch ModelMonarch Professional
XMICompressed eXtended MIdi music
XMLeXtensible Markup Language file
XMFeXtensible Music Format
XMPZXML Miradi Project ZipfileMiradi
XMVvideoXbox
XNFStandard Network File form
XnnSecondary indexesBorland Paradox
XOFRenderMorphics
XPeXtended PatternFastTracker 2.0
XPLX-Plane system fileLaminar research
XPMX11 Pixel Map graphics file
XPOMicrosoft Dynamics AX Export file
XPSOpen XML Paper Specification / OpenXPSopen standard document format initially created by Microsoft and similar in concept to Adobe PDF files
XQTExecutable fileWaffle
XQTMacro sheetSuperCalc
XRFCross-reference file
XSFdataMicrosoft InfoPath file
XSPFXML Sharable Playlist Format
XTBExternal translation tableLocoScript
XTPXTreeGold overlayXTreeGold
XVFXyngo Video FileXyngo Video Board
XWDXerox DocuWorks file (RTF internal?)DocuWorks
XWDX Window System window dump image graphics fileSDSC Image Tool
XWKKeyboard mappingCrosstalk
XWPSessionCrosstalk
XWPText fileXerox Writer
XXXX-encoded file (ASCII)XXDECODE
XXEXX-encoded file (ASCII)XXDECODE
XXXSinger Embroidery FormatEmbroidermodder
XYText fileXY Write
XY3Text fileXYWrite III
XYWText fileXyWrite III
XYZMolecular coordinatesXMol, RasMol
XZa lossless data compression file format incorporating the LZMA/LZMA2 compression algorithms.xz
Y
YArchive (Amiga)Yabba
YYACC grammar fileYacc/Bison
YALData custom/nature.yalArts & Letters
YCArchiveYACC (YAC.EXE)
YLIBYookoo Music Library Backup FileYookoo Media Player
YnnSecondary indexBorland Paradox
YMPYast Meta PackageYAST2 (SUSE Linux Package Manager)
YOOKOOYookoo PlaylistYookoo Media Player
YSTDataYASRT Raytracer scene
YRDYard Tracks FileFYM
YUVGraphics format (YUV)
YYBison grammar fileBison
YZArchiveYAC
Z
ZArchiveWinZipNT - COMPRESS - PACK
Z01-Z99Split WinRAR Archive
Z2SZoo Tycoon 2 saved gameAny game in the Zoo Tycoon 2 series
Z3Infocom game module
Z3DZmodeler-fileZmodeler 1 & 2
Z64Nintendo 64 ROMProject64 Nintendo 64 emulator
Z80SnapshotZX Spectrum emulator by g.a.lunter
ZADZFax digitized voice fileZFax
ZARGOUML model project fileArgoUML
ZCCCutpath for Zund digital cutting systemsZund Cut Center
ZDGCompressed ZiffNet text documentZview
ZEDBitTorrent LinkPodmailing
ZERData file
ZIPArchivePKZip - WinZip - Mac OS X
ZOOZoo Tycoon saved gameAny game in the Zoo Tycoon (first) series
ZURHigh level compressed file
ZUZCost estimating fileZUZIA ZUZIAbim
ZSScript for Minecraft mod MineTweaker[5]Minetweaker Minecraft Mod
ZYPReason Subtractor Patch FilePropellerhead Reason
ZZTZZT WorldAny world created using the ZZT editor