| Extension |
File Type |
File Description |
| .t | Developer | Turing Source Code File |
| .t$m | Misc | AVG Internet Security Temporary File |
| .t01 | Data | TaxCut 2001 File |
| .t02 | Data | TaxCut 2002 File |
| .t03 | Data | TaxCut 2003 File |
| .t04 | Data | TaxCut 2004 File |
| .t05 | Data | TaxCut 2005 Tax Return |
| .t06 | Data | TaxCut 2006 Tax Return |
| .t07 | Data | TaxCut 2007 Tax Return |
| .t2 | Data | Textease 2000 File |
| .t3001 | Data | TARGET 3001! Circuit Design Project File |
| .t3x | Plugin | TYPO3 Compressed Extension |
| .t64 | Disk | Commodore 64 Tape Image File |
| .taac | Image | Sun TAAC Graphic |
| .tab | Text | Guitar Tablature File (Most common) |
| .tag | Misc | DataFlex Query Tag |
| .tao | Disk | Track at Once CD/DVD Image |
| .tap | Game | Tap Tap Revenge Tap File |
| .tar | Compressed | Consolidated Unix File Archive |
| .targets | Developer | MSBuild Targets File |
| .tax | Misc | TurboTax Tax Return |
| .tax2008 | Data | TurboTax 2008 Tax Return |
| .taz | Compressed | Tar Zipped File |
| .tb | Data | Tabbery Tab File |
| .tbk | Data | ToolBook File (Most common) |
| .tbm | Game | Toribash Mod File |
| .tbs | Misc | TuneUp Utilities Boot Screen |
| .tbz | Compressed | Bzip Compressed Tar Archive |
| .tbz2 | Compressed | Tar BZip 2 Compressed File |
| .tc | Disk | TrueCrypt Volume |
| .tcd | Vector Image | Technobox CAD Drawing |
| .tcl | Developer | Tcl Script |
| .tct | Image | TurboCAD Drawing Template |
| .tcw | Image | TurboCAD Drawing File |
| .tcx | Image | TurboCAD 3D Model Text File (Most common) |
| .td0 | Disk | Teledisk Archive (Most common) |
| .tda | Data | Palm To-Do File (Most common) |
| .tda3mt | Video | DivX Author Template File |
| .tddd | Image | 3D Data Description |
| .tdf | Text | Guide Text Definition File (Most common) |
| .tdl | Misc | MathType Translator Definition Language (Most common) |
| .tds | Developer | Turbo Debugger Symbols File |
| .te | Data | Textease CT Database File |
| .te3 | Data | WinTrack Object File |
| .ted | Game | Tribes 2 Game Data File |
| .tef | Data | TablEdit Tablature |
| .temp | Misc | Temporary (Temp) File |
| .tet | Data | Textease CT Template |
| .tex | Raster Image | Texture File (Most common) |
| .text | Text | Plain Text File |
| .tfa | Data | TreeSoft CashFlow Analysis Data File |
| .tfd | Data | Tape Format Requirements Document |
| .tfmx | Audio | Final Music System Tracker Module |
| .tfrd | Data | Tape Image Format Requirements Document |
| .tfw | Image | World File for TIFF |
| .tg | Compressed | Gzip Compressed Tar Archive |
| .tg4 | Raster Image | Tiled Group 4 Raster Image File |
| .tga | Raster Image | Targa Graphic |
| .tgz | Compressed | Gzipped Tar File |
| .the | Settings | Microsoft Plus! Theme File |
| .theme | System | Microsoft Plus! Desktop Theme |
| .themepack | Settings | Windows 7 Theme Pack |
| .thm | Raster Image | Thumbnail Image File (Most common) |
| .thmx | Data | Office 2007 Theme File |
| .thp | Text | TurboTax Text String |
| .thumb | Raster Image | JAlbum Thumbnail File |
| .thx | Audio | Amiga THX Tracker Music File |
| .tib | Disk | Acronis True Image File |
| .tif | Raster Image | Tagged Image File |
| .tiff | Raster Image | Tagged Image File Format |
| .tim | Game | The Incredible Machine Level |
| .tip | Misc | TuneUp Utilities Icon Package |
| .tivo | Video | TiVo Video File |
| .tjp | Data | TaskJuggler Project File (Most common) |
| .tk | Developer | Tk Script |
| .tk3 | Data | TK3 Multimedia eBook |
| .tkfl | Data | TKLinks Saver Favorite Links File |
| .tla | Misc | TuneUp Utilities Startup Logo |
| .tlb | Text | VAX Text Library (Most common) |
| .tlc | Vector Image | The Logo Creator File |
| .tls | Misc | TuneUp Utilities Logon Screen |
| .tlz | Compressed | Tar LZMA Compressed File |
| .tm | Text | TeXmacs Document |
| .tmb | Misc | Timbuktu Pro Document |
| .tmp | Backup | Temporary File |
| .tms | Executable | Telemate Script |
| .tmw | Data | Translation Memory Data File |
| .tmx | Text | Translation Memory eXchange File |
| .tn1 | Image | Tiny Image (Low Resolution) |
| .tn2 | Image | Tiny Image (Medium Resolution) |
| .tn3 | Image | Tiny Image (High Resolution) |
| .tnef | Misc | Transport Neutral Encapsulation Format |
| .tny | Image | Atari Tiny Image |
| .toast | Disk | Toast Disc Image |
| .toc | Audio | PSP Audio File (Most common) |
| .tod | Video | JVC Everio Video Capture File |
| .tol | Data | AOL Tool File |
| .topc | Data | TopicCrunch Project File |
| .torrent | Misc | BitTorrent File |
| .tp | Video | Beyond TV Transport Stream File |
| .tpb | Data | GROMACS Binary Input File |
| .tpc | Text | Topic Connection Placeholder |
| .tpl | Misc | Document Template |
| .tpm | Misc | Trusted Platform Module Password File (Most common) |
| .tpr | Video | TMPGEnc Project File |
| .tps | Misc | Clarion TopSpeed Data File (Most common) |
| .tpu | Developer | Turbo Pascal Unit |
| .tpx | Developer | Turbo Pascal 7 Unit |
| .tr3 | Data | TomeRaider eBook File |
| .tra | Data | WinTrack Railroad Track File |
| .trc | Misc | Oracle Trace File |
| .trd | Data | TrID Definitions Package |
| .trif | Image | Tiled Raster Interchange Format |
| .trp | Video | HD Video Transport Stream |
| .trs | Data | Rosetta Stone Language Data (Most common) |
| .ts | Video | Video Transport Stream File |
| .tsk | Settings | Pocket PC Skin |
| .tsm | Settings | TwinCAT System Manager Configuration File |
| .tsp | Audio | TrueSpeech Audio File |
| .tst | Data | TestPoint Test File |
| .tstream | Misc | SwarmPlayer Streaming Torrent |
| .tsv | Data | Tab Separated Values File |
| .tsz | Settings | Trillian Skin File |
| .ttc | Font | TrueType Font Collection |
| .ttf | Font | TrueType Font |
| .ttk | Data | Catalyst Translation Toolkit |
| .ttx | Misc | Trados TagEditor File |
| .tu | Developer | Turing Source File |
| .tub | Misc | Paint Shop Pro Picture Tube |
| .tur | Developer | Turing Program Source File |
| .tvj | Text | TrueView Job Ticket |
| .tvl | Misc | TurboTax File |
| .twc | Settings | TTWin Configuration File |
| .twt | Game | Carmageddon 2 Data File |
| .txa | Data | Midas ViewPoint Text Array List |
| .txd | Data | Game Texture Dictionary |
| .txf | Data | Tax Exchange Format |
| .txt | Text | Plain Text File |
| .txw | Audio | Yamaha TX16W Audio File |
| .tz | Compressed | Zipped Tar Archive |
| .tzx | Disk | ZX Spectrum Tape Image File |
