#_T_EXTENSIONS

.T3D  UnrealEd brush format file (UnrealEd).
.T64  Cassette Tape image file = WAV/Waveform audio content created by/for numerous Commodore computer emulators (Nicola Salmoria & MAME team's MAME and other emulators).
.T64  Commodore C2N tape drive emulator image used by Commodore computer emulators.
.TAB  Crontab file (ActiveState's Komodo Edit).
.TAG  TagInfo file identifying software and product/device it is intended for (driver installers - Intel, etc.).
.TAK  Tom's lossless Audio Kompressor file (TAK library and many audio applications).
.TAR  TAR archive file = Tarball = a simple, uncompressed container file, often GZ-compressed "TAR.GZ" (Many applications).
.TASDB Archive System Database Template file (Sayyid Mohammad Saleh Samimi's Archive System 1.9).
.TASKS Task list file (Digia Qt Creator).
.TBR  Toolbar resource file (Joseph Hardy's PageCraft 2).
.TBR  TwistedBrush image file (Pixarra TwistedBrush Pro Studio).
.TBS  TeraByte Scripting language file = plain text (TeraByte BootIt Bare Metal and other TeraByte products).
.TBS  TuneUp Styler Boot Screen file (TuneUp Utilities).
.TBWML Text Block Writer Markup Language file = native document format (SoftwareByBrian's Text Block Writer).
.TCL  Tool command language/Tcl programming/scripting language source file (Tcl/Tk 8 toolkit and many text editors).
.TCL  Text Clip Library file (Text editors and Windows clipboard monitors).
.TDY  Tidy settings file (Raggett's HTML Tidy and other web page/site developer applications).
.TED  Terrain Editor file (D-Graphics' Terrain Editor/T.ED).
.TEG  Transition Effect or media clip file (Ulead Systems Media Studio 5 Video Editor).
.TEST Java Test file (Java applications).
.TEX  LaTeX file (Many applications/text processors).
.TEX  Texture file (Many graphics applications).
.TEX  Texture image file (Jasc Paint Shop Pro).
.TEXCACHE NetImmersive/Gamebryo model File (NifTools NifSkope).
.TEXTER Texter text snippets file (Bartels Media PhraseExpress).
.TEXTEXPANDER TextExpander text snippets file (Bartels Media PhraseExpress).
.TEXTURE Creative Assembly DXT1 texture file (Martin Wright's DXTBmp Editor).
.TGA  TGA format image file (Many applications, 2 format versions 1 and 2. Often called TARGA/Truvision image).
.TGD  Terragen 2 project/Document file (Planetside Terragen 2).
.TGF  Trivial Graph Format file (yWorks' yEd Graph Editor).
.TGO  Terragen Object file (Planetside Terragen 2).
.TGP  Terragen Plug-in file (Planetside Terragen 2).
.THD  Header index file (CIX's Ameol2).
.THE  The Hessling Editor file = text document (Mark Hessling's The Hessling Editor).
.THERC The Hessling Editor Resource file (Mark Hessling's The Hessling Editor).
.THL  Thumbnail images in bitmap format (Cyberlink PowerProducer).
.THM  Clip art Theme title and resources index file (IBM Lotus Symphony).
.THM  Skinning Theme files (DreamQuest Championship Euchre, Hearts, & Spades).
.THM  Theme file (Many applications).
.THM  Thumbnail image file, often sharing the same file name of a resource file whose content it illustrates (Varying types, usually JPEG, TIFF, PNG, or some form of bitmap, many applications).
.THT  Table Hockey Tournament file (Lasse Rautiainen's Table Hockey Tournament Scheduler).
.TIF  Tag Image File format (Many graphics applications).
.TIF  Tag Image File Format bitmapped image (Aldus Corporation - Numerous variants and programs).
.TIFF Tag Image File Format (Aldus Corporation - Many graphics applications).
.TIFF Tag Image File Format bitmapped image (Aldus Corporation - Numerous variants and programs) A preferred format in commercial printing for it's lossless images with good compression, PostScript, CYMK, and ICC profile support.
.TIMELINE Timeline project file (Insane Tools' 3D Flash Animator 3).
.TIP  Application usage Tips file (ACD Systems' ACDSee v3.1).
.TIP  TuneUp Icon Package file (TuneUp Utilities).
.TIXATICONFIG Tixati Configuration file (Tixati BitTorrent client application).
.TLS  TuneUp Logon Screen file (TuneUp Utilities).
.TLX  User dictionary files (e-Press EasyOffice).
.TLZMA LZMA-compressed Tarball file (SmithMicro's Stuffit Deluxe 2010).
.TMB  Thumbnail image file = bitmap image (MediaChance Real-DRAW).
.TMD  TextMaker Document file (SoftMaker Office TextMaker).
.TML  TimeLine project file (SoftLab's DDClip Pro).
.TMPL eMule Template (eMule P2P clients and mods).
.TMV  TextMaker Template file (SoftMaker Office TextMaker).
.TNF  Thumbnail File (Bruno Cancelleri's Pictoscope).
.TNFO Internal Information file (SpyBot Seek & Destroy).
.TOC  Table Of Contents file.
.TOM  Task-O-Matic task list file (Pollen's Task-O-Matic).
.TORRENT Torrent file (BitTorrent's µTorrent and other torrent/file-sharing applications).
.TPL  Template file (KetilO's FbEdit FreeBASIC Editor, Fookes Holdings' NoteTab and other text editors).
.TPL  Template file (Many formats and applications).
.TPL  Template file (Twelve Tone's Cakewalk).
.TPL  Web project Template file (ixla Web Easy).
.TPS  Paper Space Template file (Upperspace's DesignCAD 3D MAX).
.TRAY Corel Connect 3 Tray file (Corel's CorelDRAW X6).
.TRAY~ Temporary Corel Connect 3 Tray file (Corel's CorelDRAW X6).
.TRC  Traces animation file (Berkeley Systems After Dark Deluxe 4).
.TRI  Triangle binary file = geometry data in triangular format (Alias Research's Power Animator/Studio and other applications).
.TRK  Track summary file (CFB Software's LP Ripper).
.TRS  Transcriber annotation file = XML markup (Media transcription applications and supporting players).
.TS   Message catalog file.
.TS   MPEG transport stream = MPEG video file (ffMPEG, VLC, MPlayer, Safari, and many other applications).
.TSB  TriSpectives WorkBook file (3D/EYE's TriSpectives).
.TSC  TriSpectives Catalog file (3D/EYE's TriSpectives).
.TSH  T-Shirt project file (MindScape PrintMaster).
.TSK  Task parameters file (SomeWare d'peg! Cicada).
.TSP  StylePix image project file (Hornil StylePix).
.TST  Test file with answers marked = text (Stepware's AceReader Pro).
.TSTREAM TStream file (Tribler).
.TSV  Tab-delimited Log file (Microsoft Windows Performance Monitor).
.TSV  Tab Separated Values file = Data values delimited by a single tab character (Many applications use this as a storage method of plain text data).
.TT   Text Template file (Microsoft Visual Studio 9).
.TTA  TrueAudio audio file (Many audio applications).
.TTC  True Type font Collection file = an extension of the True Type font file (See Wikipedia TrueType page's Collection entry).
.TTF  True Type Font file (Many applications, Wikipedia TrueType Font entry).
.TTXT MPEG4 Timed Text format sub-title file (Media player applications and hardware).
.TUB  Tube file (Jasc Paint Shop Pro).
.TUN  Microtuning file = permits adjustments of VSTi instrument effects tonal qualities (LinPlug Virtual Instruments' Albino2FX).
.TVS  TuneUp Visual Styler visual style format (TuneUp Software's TuneUp Utilities).
.TWS  TextPad Workspace file (Helios Software TextPad).
.TX   ADTdirect dummy loader file (CorelCAD).
.TX   Text file = plain text.
.TXR  Multi-language Text Resource file (Difitec WavePurity).
.TXT  Text file = plain text (Many applications and operating systems).
.TXT+ Encoded text file = similar to ROT13 (Fortel's VisualRoute 5).