
File Extensions
Windows/OS2/Apple/UNIX
Select Extension by starting letter:
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OTHER - Allowed
chars in file names - what is an extension?
Links - Converters - Multimedia Converters
graphical file
formats - Potentially harmful
extensions
internals - contributors
H
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item
Viewer for images/pictures: See Multimedia/XnView
Player for sound/music: See Multimedia/2pat20
Universal dump utility for non-destructive dump/list/string search etcdump.zip
T = Alchemy chemical modeller output fileT = Mime: application/x-troffT = Paradox database fileT = roff /troff unformatted manual pageT = Tads sourceT = Tester symbol table (ReaGeniX code generator)T = Unix Tape Archive = TAR without compression (tar)T#? = Time Line FileT$ = Modem Bitware Fax disk5 fileT$2a = (MAC FILE_TYPE) Timbuktu ProT$AB = (MAC FILE_TYPE) Timbuktu Pro Address BookT01 = Tonline Netscape fileT02 = Tonline Netscape fileT2 = TrueType FontT2K = Teach2000 DocumentT2T = Sonata CAD modeling fileT2W = Ntgraph Turbo Pascal fileT3 = Tarshare fileT32 = Drive Image5 fileT3D = Epic's Unreal Editor 3D scene formatT3D = Game: FiFa2000 environment fileT44 = dBASE IV temporary fileT4G = Tscad4 fileT4L = Tscad4 biblio fileT64 = Commodore 64 emulator tape (C64S emulator)T65 = Adobe PageMaker templateT98 = Kiplinger Tax Cut File (1998 Tax Year)T99 = (Note: Kiplinger Tax Cut State Return Files are of the form .T??T?? = Ingres Table/Index File (?? = Hex 00 to FF)TAAC = Sun TAAC bitmap imageTAB = Colour lookup table (CMYK image) (Stork format)TAB = Lotus 1-2-3 tableTAB = Microsoft Map tableTAB = TAB separated fileTAD = Mime: application/octet-streamTAF = Tonline Db fileTAG = DataFlex query tag nameTAG = Mime: text/prs.lines.tagTAGS = MIME Tag types siteTAH = Turbo Assembler Help fileTAI = INMOS Transputer Development System Occam Analyse InfoTAJIMA = Tajima DST file format (MS Word)TAL = Adobe TypeAlign text illustrationTALK = Mime: plugin/talkerTALK = Mime: text/x-speechTALK = Mime: x-plugin/x-talkerTALK = Text to speechTAM = Tame Program SettingsTAO = IsoBuster FileTAP = TAPe file (ZX Spectrum emulator by G.A. Lunter)TAP = Wave Sound, Action WaveTAR = Mime: appliation/x-tarTAR = Mime: application/x-tarTAR = Tape Archive, Unix standard Archive format / not compressedTARDIST = Mime: application/x-tardistTARGA = Truevision TarGA bitmap imageTAT = Grafic twain Toolkit fileTAX = Turbotax FileTAZ = Mime: application/x-tarTAZ = TAR Compressed Tape Archive, Gzip/CompressTB1 = Borland Turbo C font fileTB2 = Borland Turbo C font fileTB_ = Visc15 Adressen Setup fileTBB = MS Windows Office Toolbar ButtonTBC = Formula 1 car race 2001 Season01 Vehicles fileTBD = Microsoft Mse fileTBF = Fax (Imavox TurboFax)TBF = Trellian Button Factory File http://www.trellian.com/tbf/index.htmlTBI = Game: fifa 2001 data cmn be fileTBK = Memo backup (dBASE IV/FoxPro)TBK = Mime: application/toolbookTBK = Mime: application/x-tbookTBK = ToolBooK (Asymetrix ToolBook)TBL = Dynamic link libraryTBL = TaBLe, used by several programstbnd = (MAC FILE_TYPE) Communication ToolTBP = Mime: application/x-timbuktuTBR = Norton Desktop custom ToolBaRTBS = German Ms Word text elements (TextBauSteine)TBS = Intel VTune performance monitorTBT = Mime: application/timbuktuTBX = Project Scheduler 4 tableTC = Borland C++ Configuration (former Turbo C)TC = TermcapTCC = Turbo C / Gcc include std fileTCD = TurboCAD for DOSTCH = Help file (Turbo C/Borland C++)TCI = INMOS Transputer Development System Occam Configuration InfoTCL = Mime: application/x-tclTCL = Mime: text/x-script.tclTCL = Tcl/Tk (Tool Command Language) script source codeTCL = TextPad Clip LibraryTCL~ = Tcl/tk fileTCM = INMOS Transputer Development System Occam Comment Text FileTCO = T9000 object modulesTCP2 = (MAC FILE_TYPE) TCP/Connect IITCPa = (MAC CREATOR CODE) America On Line TCPa_textTCPa = (MAC FILE_TYPE) AOL Web BrowserTCPSTREAM = Snort fileTCSH = Mime: text/x-script.tcshTCSH = Unix shell script (tcsh)TCT = Bc31 Bin fileTCW = TurboCAD for Windows drawingTD = Borland Turbo Debugger for DOS configuration fileTD0 = Teledisk disk image (compressed diskette in a file)TD1 = TeleDisk ArchiveTD2 = Borland Turbo Debugger for Win32 configuration fileTD3 = TeleDisk ArchiveTD4 = RollerCoaster Tycoon Track DesignTD? = TeleDisk ArchiveTDAT = (MAC FILE_TYPE) CodeWarrior Data FileTDB = TACT databaseTDDD = Imagine Object File FormatTDF = Bitstream Fontware DescriptionTDF = MS Setup program data; see STFTDF = Speedo Typeface Definition FileTDF = TheDraw fontTDH = Borland Turbo Debugger Help fileTDI = Alias Wavefront imageTDI = TDI Explore imageTDIM = Digital F/X image formatTDK = Borland Turbo Debugger Keystroke recordingTDL = Intuit de online dat fileTDL = Stratum library fileTDO = Thumbs32 fileTDP = Midiprg Thedrums compressed fileTDR = Contents of Arvid tapeTDS = Borland Turbo Debugger Symbol tableTDW = Borland Turbo Debugger for Windows configurationTDX = Visual FoxPro Offline ViewTDY = Tandy fileTE2 = Conquest of the New WorldTEA = Tea Template Source FileTEB = HDL test bench fileTEC = "Tanner Ledit" Layout technology dataTEF = Fax (Relisys TEFAX)TEL = Telnet host fileTEM = Borland C++ Turbo Editor Macro Language scriptTEM = IconAuthor input templateTEMP = SWISH-E fileTER = CorelFlow line terminator (arrow picture)TER = TerraGen TERrain TerrainTERMS = cygwin tk8.0 demos fileTERRAIN = TerraGen TerrainTET = Tetris results (DN)TEX = Idealist datasheetTEX = LaTeX text (unix)TEX = Mime: application/x-texTEX = on WINDOS old fashion TEXT fileTEX = PaintShopPro Texture image formatTEX = TEX EquationTEX = Text document (Unix TeX )TEX = Texture picture Windows' Hover gameTEX = TEXture used in Paint Shop ProTEXI = Mime: application/x-texTEXI = Mime: application/x-texinfoTEXI = TEXINFOTEXINFO = Mime: application/x-texinfoTEXINFO = Same as TEXITEXT = (MAC FILE TYPE) BinHex (PC ext: HQX)TEXT = (MAC FILE TYPE) HTML files created by PageMill (PC ext: HTM)TEXT = (MAC FILE TYPE) HTML for Internet Explorer (see A Web Site on a CD for more explanations) (PC ext: HTM)TEXT = (MAC FILE TYPE) HTML for Netscape Navigator (see A Web Site on a CD for more explanations) (PC ext: HTM)TEXT = (MAC FILE TYPE) Illustrator 3 (PC ext: AI)TEXT = (MAC FILE TYPE) Mathematica (all kinds of files)TEXT = (MAC FILE TYPE) SimpleText File (PC ext: TXT)TEXT = (MAC FILE_TYPE) BinHex Encoded FileleTEXT = (MAC FILE_TYPE) C Header Filelea FileTEXT = (MAC FILE_TYPE) C Source FileTEXT = (MAC FILE_TYPE) C++ Source FileTEXT = (MAC FILE_TYPE) HTML DocumentTEXT = (MAC FILE_TYPE) HTML Documentd FileleTEXT = (MAC FILE_TYPE) Perl Source FileTEXT = (MAC FILE_TYPE) Postscript FileTEXT = (MAC FILE_TYPE) Rez Resource FileTEXT = (MAC FILE_TYPE) Text FileTEXT = (MAC FILE_TYPE) XML Document FileTEXT = Mime: application/plainTEXT = Mime: application/textTEXT = Mime: text/plainTEXT = Raw TEXT fileTF = TinyFugue MUD client macroTF = Turbo Profiler configurationTFA = Turbo Profiler Area fileTFC = Catalogue file (Tobi's Floppy Cataloguer)TFH = Turbo Profiler Help fileTFM = Tagged Font Metric file (Intellifont/TeX)TFMX = Amiga Audio file (Final Musicsystem eXtended)TFS = Turbo Profiler statistical informationTFW = (header needed for georeferencing) files for MrSIDTFW = ArcView world file for tif imageTFX = Traffix Traffic Analysis SoftwareTG = Technical Guidance (NRC Inspection Manual)TG1 = On Target project fileTG4 = TG4 image formatTGA = Truevision TarGA bitmap image (may be RLE compressed)TGF = Mime: chemical/x-mdl-tgfTGH = TrueGas Host FileTGI = Pbm fileTGQ = Bullfrog Software : Movie (Dungeon Keeper 2)TGT = Corel40 Custom fileTGV = Electronic Arts : Video file (Need for Speed, NBA)TGW = TerraGen WorldTGWORLD = TerraGen WorldTGZ = Mime: application/gnutarTGZ = Mime: application/x-compressedTGZ = Mime: application/x-tarTGZ = ZIP Archive; TAR Tape Archive (probably Gzip compressed); see TAR,TAZ,GZTH = Javasoft Jre 1.3,lib fileTHA = WINXP SYSTEM32 fileTHB = Clipart; Hijack ThumbnailTHD = ThreadTHE = Microsoft Plus Pack Desktop ThemeTHELP = Compiler/decompiler for Borland Help Files (file format in German)THEM = MS Windows Desktop ThemeTHEME = Windows 95 Desktop ThemeTHM = THuMbnail bitmap image used by eg. Picture Publisher and PhotoMagic ThumbnailTHME = (MAC FILE_TYPE) Microsoft Theme FileTHML = Theological HTML (HTML with Greek Fonts etc)THN = Graphics Workshop for Windows thumbnailthng = (MAC FILE_TYPE) ThingTHNL = Same as THNTHOR = Database description (THOR database)THP = TurboTax-related FileTHS = WordPerfect for Win THeSaurus dictionaryTHX = Amiga THX Tracker musicTI = Temporary Instruction (NRC Inspection Manual)TI = Temporary Instruction (NRC Inspection Manual)TIC = FTN special file with associated file description (ALLFIX)TID = "IBM Voice Type" languages tasks fileTIF = Aldus Tagged Image File Format (TIFF) bitmap image, many different formats (Uncompressed, Huffman compressed, LZW,Jpeg,CCITT3/4, G3 FAX, G4 FAX, Packed Bits)TIF = Mime: image/tiffTIF = Mime: image/x-tiffTIFF = (MAC FILE TYPE) TIFF fileTIFF = Aldus Tagged Image File Format (TIFF) bitmap image, many different formats (Uncompressed, Huffman compressed, Jpeg,LZW,CCITT3/4, G3 FAX, G4 FAX, Packed Bits)TIFF = Mime: image/tiffTIFF = Mime: image/x-tiffTIG = Tiger file, used by U.S. government to distribute mapsTIL = Buttonz & Tilez texture image formatTIL = Fuzzy logic knowledge base (Togai InfraLogic Fuzzy-C Compiler)TIM = Sony PlayStation bitmap imageTIM = Tagged Image File FormatTINF = (MAC FILE_TYPE) Microsoft Theme Info FileTIP = Tip of the day for Microsoft and MFC applications.TIS = MahJongg 3.0 tile setTJF = VAXTPU Backup File (VAXTPU is default OpenVMS editor)TJL = Backup file (VAXTPU editor)TJS = SoundTK2 = Take Two view fileTKI = Mime: application/x-tkinedTKINED = Mime: application/x-tkinedTL_ = Game: doko inst fileTLB = Bubble Chamber reference tableTLB = Remote Automation OLE TypeLiB files, Dynamic Link LibraryTLB = Text library (VAX)TLC = Compiled Tool Command Language source code (Geoworks Swat)TLD = Teledisk disk imageTLE = NASA Two-Line Element SetTLF = Opengl Stonehenge fileTLH = Adder100 source fileTLI = Adder100 source fileTLIST = 3d GraphicTLO = SPSS TableLooks file http://www.cam.ac.uk/cs/docs/leaflets/m583/TLP = TimeLine projectTLR = Ccs-lib.2 Acs fileTLS = Zortech 21 Readme fileTLT = Trellix Web Design FileTLX = Goldwave 402 fileTM = Bitmap image (EOSAT's Landsat Thematic Mapper data file)TMAP = Real Pool ImageTMB = Tmx editor user fileTMC = DCI TradeManager Catalog ArchiveTMD = Lotus TvMap DocumentTMD = Swisslog TimeData fileTME = Swisslog TimeStudy Event HistoryTMF = Tagged Font Metric file (WordPerfect for Win)TMK = Turbopas Tp_tour fileTML = Padgen fileTMO = Ztg global optimizer default output file (Zortech C++)TMP = temporary fileTMPL = SWISH-E example fileTMS = Telemate compiled scriptTMT = temporary fileTMX = Tmx editor fileTN1 = Tiny image formatTN2 = Tiny image formatTN3 = Tiny image formatTN? = 2d GraphicTNB = Windows BitmapTNG = Audio Utility Tuningwrench compressed fileTNI = Virtua Tennis Menufiles Common fileTNL = Thumbnail image formatTNPOLY = Triangulated polygon filesTNV = Bitware Fax fileTNY = TiNY bitmap image used on AtariTOC = FrameMakerTOC = Mime: application/tocTOC = Table Of Contents (index file)TOCF = (MAC FILE_TYPE) Eudora TOCTOK = Borland C++ 4.x external tokensTOL = Tonline Bsw4 tol fileTOMBRAIDER 3 = Tomb raider 3 save gameTON = Wave Siggen-2.1 fileTOO = Asm Objasm fileTOOLS = Dos djgpp tools fileTOP = IBM netfinity Rack Configurator extensionTOR = Guitar Musik trainer Register.ds fileTOR = Nba 99 art ingame anims fileTOS = Self-extracting file archive (Atari ST)ToyS = (MAC CREATOR CODE) Script Editor ToyS textToyS = (MAC FILE_TYPE) Script EditorTP = Turbo Profiler session-state fileTP3 = Harvard Graphics DOS 3.0 TemplateTP4 = RollerCoaster Tycoon Track Design ScreenshotTP? = Tracker Packer v1/v2/v3 formats (music/sound)(Asle / ReDoX)TPA = Corel Graphics10 Custom fileTPB = Downloadable PCL Soft font file backup (HiJaak)TPC = Rtfgen fileTPF = Downloadable PCL Soft font file (HiJaak)TPH = Turbo Pascal Help fileTPI = Tonline fileTPIC = (MAC FILE_TYPE) TARGA ImageTPL = CakeWalk Audio Template fileTPL = Mime: application/vnd.groove-tool-templateTPL = Resident units library (Turbo Pascal)TPL = TemPLate (Harvard Graphics/GoldEd/ITrack)TPL = Template for Page Express; see DTPTPL = Ulead iPhoto Express TemPLateTPM = TextPad Macro (Windows text editor); see TCLTPO = 3d GraphicTPOLY = 3d GraphicTPP = Borland Pascal 7.0 Protected Mode UnitsTPS = WN16 DICT fileTPT = Thumbs32 fileTPU = Command file (VAXTPU editor)TPU = Enable TeleprocessingTPU = Turbo Pascal UnitTPV = Packed graphics file (TutorPro)TPW = Turbo Profiler for Windows session-state fileTPW = Turbo/Borland Pascal Unit (Windows library)TPZ = TAR.GZ compressed file archive (Tar and GNUzip)TPZ = Treepad Archive; text + pictures = zipTQF = Chemical test (Chemical-mime)TR = Mime: application/x-troffTR = TomeRaider databaseTR = Turbo Debugger for DOS session-state settingsTR = Unformatted manual page (Roff/nroff/troff/groff)TR0 = Spice : transient analysis outputTR1 = "IBM Voice Type" languages Addword fileTR2 = Turbo Debugger for Win32 session-state settingsTR3 = Spice : transient analysis outputTR4 = Spice : transient analysis outputTR5 = Tree Professional FileTR6 = Spice : transient analysis outputTR7 = Spice : transient analysis outputTR8 = Spice : transient analysis outputTR9 = Spice : transient analysis outputTRA = Mime: application/vnd.trueapptran = (MAC FILE_TYPE) Document ConvertTRANS = Amaya fileTRC = Debug support file (Power CTrace)Trce = (MAC FILE_TYPE) CorelTraceTRE = PC-Tools directory TREe fileTRI = Alias TRIangle fileTRIF = Bitmap image (Tiled Raster Interchange Format)TRIPLE-S = Surveying file formatTRK = Mime: x-lml/x-gpsTRK = physical layout files (3d)TRK = TRacK (i.e. video sequence) used by many gamesTRM = Mime: application/x-msterminalTRM = Terminal; (generic name)TRM = Windows 3.x Terminal configuration settingsTRN = MKS Source Integrity project usage logTRN = Translation (Windows)TRN = Translation support file (Quattro/Clarion)TRO = "IBM Voice Type" languages Vocabels fileTROFF = Typesetting devices converted text formatTRP = Watcom binw fileTRS = Micrografx executable fileTRT = Team Sports Scheduling System Report TemplateTRU = TRUe Basic sourceTRW = Borland Turbo Debugger for Windows session-state settingsTRZ = Accusoft Alldemo fileTSB = TriSpectives 3D DrawingTSC = Win Help related fileTSI = Mime: audio/tsp-audioTSI = Mime: audio/tsplayerTSK = Trend Pc-cillin 2000 fileTSM = Turbo Assembler for OS/2 manualTSN = Midi filetsnd = (MAC FILE_TYPE) Theme Sound FileTSP = Mime: application/dsptypeTSP = Mime: audio/tsplayerTSP = Windows telephony Service ProviderTSQ = ODBC scriptTSR = Swisslog TranStats ReportTSS = Team Sports Scheduling System Project FileTST = WordPerfect for Win printer test fileTSV = Mime: text/tab-separated-valuesTSV = Tab Separated ValuesTSX = Team Sports Scheduling System XML Project FileTT = True type font fileTT_ = Compressed TTFTTBS = (MAC FILE_TYPE) PowerPoint Toolbars FileTTC = TrueType Font Collection, multiple fonts in a single file(Far East Windows)TTF = Mime: application/octet-streamTTF = TrueType Font, variable sizeTTK = Corel Catalyst Translation Tool KitTTL = Tera Term Macro FileTTO = Client access data specification file (AS/400) (Server to Client)TTP = Atari Falcon ApplicationTTR = TrueType Fontttro = (MAC FILE TYPE) SimpleText Read-Only ttxt_ttrottro = (MAC FILE_TYPE) ReadMe FileTTTa = (MAC FILE_TYPE) TableText Tablettvf = (MAC FILE_TYPE) PlainTalk VoiceTTXT = (Creator Code Mac) SimpleText "ttxt" (all lower case. This was also used by TeachText)ttxt = (MAC CREATOR CODE) SimpleText File (PC ext: TXT)ttxt = (MAC FILE_TYPE) SimpleTextTTY = Macromedia Dreamweaver 4 fileTTZ = Mime: application/t-timeTUB = PaintshopPro(5) picturetube, a multi-celled pictureTUD = The Ultimate Draw documentTUN = Fifa World Cup fileTUR = Visual Turing (a Turing machine simulator) Save file for machines.TUR = Webalizer Lang fileTURBOC3 = (make-)file for Borland Turbo CTURBOT = Mime: image/florianTUT = Tutorial (generic)TUV = Generic Tutorial fileTUW = Microsoft Office fileTV = Paradox table view settingsTV1 = WordPerfect for Win overflow file above insert point in Doc 1TV2 = WordPerfect for Win overflow file above insert point in Doc 2TV3 = WordPerfect for Win overflow file above insert point in Doc 3TV4 = WordPerfect for Win overflow file above insert point in Doc 4TV5 = WordPerfect for Win overflow file above insert point in Doc 5TV6 = WordPerfect for Win overflow file above insert point in Doc 6TV7 = WordPerfect for Win overflow file above insert point in Doc 7TV8 = WordPerfect for Win overflow file above insert point in Doc 8TV9 = WordPerfect for Win overflow file above insert point in Doc 9TVC = LOTUS 1-2-3 table fileTVex = (MAC FILE_TYPE) MoviePlayer Plug-inTVF = dBASE table view settingsTVM = Mime: application/x-tvmlTVML = Mime: application/x-tvmlTVOD = (MAC CREATOR CODE) JPEG 2 File by QT (PC ext: JPG)TVOD = (MAC CREATOR CODE) Quick TimeTVOD = (MAC CREATOR CODE) QuickTime movie files (PC ext: MOV)TVOD = (MAC FILE_TYPE) MoviePlayerTVR = Boot fileTVX = VoxPhone / TeleVoxTW_ = Compressed Scanner us driver fileTWAIN = TWAIN 1.8 Specification (Adobe Acrobat)TWD = SYSTEM fileTWE = 3d GraphicTWF = TabWorks dataTWG = ThatWaltGuy Web Server FileTWK = Bc31 Bgi2 tweak-fileTWN = Op9630 Settings fileTWN = Scanner Settings fileTWP = Toplevel Computing Fine Words (DOS Word Processor)TWS = TextPad0.TWS (Shareware Windows text editor TextPad current settings)TWT = Carmageddon 2 : Carpocalyse Now (saved game)TWW = Tagwrite TemplateTX = Photoline5 hlp fileTX$ = Driver Modem Bitware disk4 fileTX$ = Poppad fileTX0 = virus notation fileTX16W = Yamaha TX-16W sampler filesTX8 = 8-bit ASCII textTX_ = Compressed txt fileTX_ = Webcd fread fileTXB = Game: fifa 2001 data environ fileTXC = Urban Chaos Game FileTXF = Mime: application/vnd.Mobius.TXFTXF = TAR.F compressed file archive (TAR and Freeze)TXI = TeX support fileTXK = Kardplay 1.62 fileTXL = (3d) texture lib file (many prgs)TXL = programming language designed to support computer software analysis and source transformation tasksTXM = Steuer2001 Daten fileTXN = Mfhdf Doc fileTXR = Corel Graphics10 Custom fileTXT = ANSI (Windows) TeXTTXT = DisplayWrite documentTXT = many Dos Text editors used this extensionTXT = Mime: application/textTXT = Mime: text/plainTXT = OEM (Dos) TextTXT = plain TextTXT = Unix format Text(lf only)TXW = Yamaha TX-16W Wave File (Convert (c) Villena)TXX = DataPerfect Text StorageTXZ = Morfwarp au fileTX~ = Compressed txt fileTYM = PageMaker 4 time stampTYP = Thumbs32 fileTZ = TAR.Z compressed file archive (TAR and Compress)TZB = TAR.Z.btoa compressed file archive (TAR - Compress - Btoa)TZD = Netscape Communicator locale file
Search: Use ctrl-F to search for
item
Viewer for images/pictures: See Multimedia/XnView
Player for sound/music: See Multimedia/2pat20
Universal dump-utility for non-destructive dump/list/search string etc dump.zip
Select Extension by starting letter:
A
- B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U -
V
- W - X - Y - Z - OTHER - Allowed chars in
Filenames - what is an extension?

If you find an extension missing, write! No
guaratee given for completeness or correctness. If you feel an
extension is outdated, write!
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"what program opens xxx": search@file-ext.com
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