| 1 | T | Holt Software | Turing Source Code Format |
| 2 | T$M | Grisoft | AVG Internet Security Temporary Format |
| 3 | T08 | H&R Block | TaxCut 2008 Tax Return |
| 4 | T2 | Lightroom Education | TrueType Font Format |
| 5 | T64 | N/A | Commodore 64 Tape Image Format |
|
| 6 | TAAC | Sun Microsystems | Sun TAAC Image Format |
| 7 | TAB | Pitney Bowes Software | MapInfo TAB Format |
| 8 | TAK | MAGIX | Music Maker Take Format |
| 9 | TALF | N/A | MAC OS X app licence |
| 10 | TAO | N/A | Track At Once CD/DVD Image |
| 11 | TAP | N/A | Commodore 64 Cassette Tape Image |
| 12 | TAR | Jean-loup Gailly | Consolidated Unix Format Archive |
| 13 | TAR-GZ | N/A | Gzip Compressed TAR Archive |
| 14 | TAR-Z | N/A | TAR Compressed Archive |
| 15 | TAR.GZ | The GNU Project | Compressed Tarball Format |
| 16 | TAR.Z | The GNU Project | Tar.Z Compressed Archive |
| 17 | TAX | Intuit | TurboTax Tax Return |
| 18 | TAX2008 | Intuit | TurboTax 2008 Tax Return |
| 19 | TAX2009 | Intuit | TurboTax 2009 Tax Return |
| 20 | TAX2010 | Intuit | TurboTax 2010 Tax Return |
| 21 | TAX2011 | Intuit | TurboTax 2011 Tax Return |
| 22 | TAX2012 | Intuit | TurboTax 2012 Tax Return |
| 23 | TAZ | N/A | Tar Zipped Format |
| 24 | TBG | BioWare | Infinity Engine Game |
| 25 | TBL | Blizzard Entertainment | Table Format |
| 26 | TBN | XBMC | XBMC Thumbnail Image |
| 27 | TBR | JustSystems Corp. | SoftQuad XMetaL Configuration |
| 28 | TBX | SDL plc. | Trados Glossary |
| 29 | TBZ | N/A | Bzip Compressed Tar Archive |
| 30 | TBZ2 | N/A | Tar BZip 2 Compressed Format |
| 31 | TC | TrueCrypt | TrueCrypt Volume |
| 32 | TCL | N/A | Tcl Script |
| 33 | TCM | IMSI | TurboCAD Mac Drawing |
| 34 | TCX | Garmin | Training Center Database Format |
| 35 | TDI | N/A | Explore (TDI) & Maya Image Format (IFF Format) |
| 36 | TDL | N/A | Tab Delineated Format |
| 37 | TDO | N/A | Generic |
| 38 | TDS | Borland Software Corporation | Borland Turbo Debugger Symbol Table Format |
| 39 | TDUMP | N/A | Java HotSpot Thread Dump |
| 40 | TEA | N/A | Tea Source |
| 41 | TEC | SIL International | TECkit Compiled Mapping Format |
| 42 | TEMPLATE | Apple | Apple Pages Template |
| 43 | TEMPORARYITEMS | Apple, Inc. | Mac OS X Temporary |
| 44 | TER | Planetside Software | TerraGen Landscape |
| 45 | TERM | Apple, Inc. | Apple Mac OS X Terminal |
| 46 | TERMINAL | Apple | Terminal Settings Format |
| 47 | TEX | Donald Knuth | LaTeX Source Document |
| 48 | TEXT | N/A | Plain Text Format |
| 49 | TEXTCLIPPING | Apple | Mac OS X Text Clipping Format |
| 50 | TEXTEXPANDER | SmileOnMyMac, LLC | TextExpander |
| 51 | TEXTILE | The Eclipse Foundation | Eclipse IDE WikiText Document |
| 52 | TEXTMATE_INIT | GNU Project | Unix Shell Script (bash) |
| 53 | TEXTUREPACK | exDream GmbH | Arena Wars Texture Pack |
| 54 | TEXTUTILS | The GNOME Project | Gnome Desktop |
| 55 | TFC | Epic Games | Unreal Engine 3 Texture Format Cache |
| 56 | TFIL | Blizzard Entertainment | Blizzard Software Update Format |
| 57 | TFW | ESRI | World Format For TIFF |
| 58 | TFX | Avid | Tax Exchange |
| 59 | TG | TuxGuitar | Gzip Compressed Tar Archive |
| 60 | TG4 | Bentley Systems | Tiled Group 4 Raster Image Format |
| 61 | TGA | Avid Technology | Targa Graphic |
| 62 | TGML | N/A | Tecumseh Group Markup Language |
| 63 | TGO | Planetside Software | Terragen 2 Object |
| 64 | TGP | Jo Meder | TGPGuiLib Terragen Plugin |
| 65 | TGX | Firefly Studios Ltd. | Stronghold |
| 66 | TGZ | N/A | Gzipped Tar Format |
| 67 | THB | N/A | KinuPix Skin |
| 68 | THD | N/A | Dolby TrueHD Audio |
| 69 | THEMEPACK | Microsoft | Windows 7 Theme Pack |
| 70 | THM | Sony Ericsson | Thumbnail Image Format |
| 71 | THMX | Microsoft | Office 2007 Theme Format |
| 72 | THOR | N/A | Generic |
| 73 | THS | Corel Corporation | Corel WordPerfect Thesaurus Dictionary |
| 74 | THTML | N/A | Generic |
| 75 | TIC | Nesbox | TruKnox Cache |
| 76 | TIF | Adobe Systems | Tagged Image Format |
| 77 | TIFENX | N/A | egis encrypted TIFF image |
| 78 | TIFF | Adobe Systems | Tagged Image Format |
| 79 | TIFW | N/A | Blender GIS world data |
| 80 | TIGER | Crystal Dynamics | Tomb Raider Game Data Archive |
| 81 | TIL | NovaLogic, Inc. | Nova Logic Game Tile |
| 82 | TILEMAP | N/A | XML Tilemap Format |
| 83 | TIMESTAMP | ESRI | Geodatabase Timestamp File |
| 84 | TIN | Bentley Systems, Incorporated | Bentley GEOPAK Environmental Modeling Systems |
| 85 | TINY | The GNOME Project | Gnome Desktop |
| 86 | TIS | Acronis | TruKnox Captured Device Settings Format |
| 87 | TIW | Bentley Systems, Incorporated | Bentley InRoads |
| 88 | TKO | AMX | Win32/Oficla Trojan Format |
| 89 | TKP | MicroImages, Inc. | MicroImages SML Script Standalone Application |
| 90 | TLB | Microsoft | OLE Type Library |
| 91 | TLK | BioWare | BioWare Aurora Engine Talk Table Format |
| 92 | TLX | N/A | Standard Dictionary Format |
| 93 | TLZMA | N/A | LZMA Compressed Tar Archive |
| 94 | TM2 | N/A | PlayStation 2 Graphic |
| 95 | TMD | SoftMaker Software | TextMaker Document |
| 96 | TMF | Corel Corporation | Corel WordPerfect Tagged Font Metric |
| 97 | TMLANGUAGE | MacroMates | TextMate Language Grammar Format |
| 98 | TMP | N/A | Temporary Format |
| 99 | TMPL | The Swish-e Project | SWISH-E Example Format |
| 100 | TMPREFERENCES | MacroMates Ltd. | TextMate Preference |
| 101 | TMV | SoftMaker Software | TextMaker Template |
| 102 | TN1 | Atari | Tiny Low Resolution Image |
| 103 | TNEF | Microsoft | Transport Neutral Encapsulation Format |
| 104 | TNF | Microsoft Corporation | Transport Neutral Encapsulation Format |
| 105 | TNK | N/A | Generic |
| 106 | TNS | Texas Instruments | TI-Nspire Document |
| 107 | TNSP | Texas Instruments | TI-Nspire PublishView Document |
| 108 | TOC | QUALCOMM | Eudora Table Of Contents |
| 109 | TOD | JVC | JVC Everio Video Capture Format |
| 110 | TOH | BioWare | Infinity Engine Game |
| 111 | TOML | Tom Preston-Werner | TOML Configuration File |
| 112 | TOOL | Apple, Inc. | Apple Mac OS X Terminal |
| 113 | TOPX | Rick Meyers | E-sword Topic Note |
| 114 | TORRENT | BitTorrent | BitTorrent Format |
| 115 | TOT | BioWare | Bioware Infinity Game Engine Talk Table Override Text |
| 116 | TP | SnapStream Media | Beyond TV Transport Stream Format |
| 117 | TP0 | Squared 5 | Mascom PVR Video Format |
| 118 | TPJ | N/A | Nova Logic Game Terrain Project |
| 119 | TPK | The Linux Foundation | Tizen Application Package |
| 120 | TPL | N/A | Document Template |
| 121 | TPO | National Geographic Maps | TOPO! MapXchange Document |
| 122 | TPS | TiePie engineering | Scam Torrent Format |
| 123 | TPZ | Amazon | Kindle Topaz EBook Format |
| 124 | TRASHES | Google Inc. | Google Android Mobile Phone |
| 125 | TRASHINFO | N/A | Trash Storage Metadata |
| 126 | TRAY | Corel | Corel CONNECT Tray Format |
| 127 | TRC | Oracle | Oracle Trace Format |
| 128 | TRE | Electronic Arts, Inc. | EA SPORTS Game |
| 129 | TREC | TechSmith Corporation | Camtasia Studio Recorded Session |
| 130 | TRIDEFLICENSE | N/A | Dynamic Digital Depth license |
| 131 | TRIG | N/A | TriG RDF serialization format |
| 132 | TRP | N/A | HD Video Transport Stream |
| 133 | TRX | Microsoft | Visual Studio Test Results Format |
| 134 | TS | N/A | Video Transport Stream Format |
| 135 | TS0 | N/A | Tio32 Script |
| 136 | TS1 | VirtualBus | VirtualBus Texture Description Format |
| 137 | TS4 | N/A | Recorded Multimedia |
| 138 | TSA | N/A | jnana.tsa malware |
| 139 | TSC | Microsoft | Microsoft Windows WinHelp Related Format |
| 140 | TSCPROJ | TechSmith | TechSmith Camtasia Project File |
| 141 | TSI | Native Instruments | Traktor Settings Format |
| 142 | TSK | N/A | Pocket PC Skin |
| 143 | TSTREAM | p2p-next consortium | SwarmPlayer Streaming Torrent |
| 144 | TSV | N/A | Tab Separated Values Format |
| 145 | TT | Microsoft | Visual Studio Text Template |
| 146 | TT2 | Microsoft | Microsoft Temporary Font Installation File |
| 147 | TTA | True Audio Software | True Audio Format |
| 148 | TTARCH | Telltale Games | Telltale Games Archive |
| 149 | TTARCH2 | Telltale, Inc. | The Walking Dead Season Two Game Data |
| 150 | TTBS | Microsoft Corporation | Microsoft PowerPoint For Mac Toolbar |
| 151 | TTC | N/A | TrueType Font Collection |
| 152 | TTE | Microsoft | Private Character Editor Format |
| 153 | TTF | Apple | TrueType Font |
| 154 | TTI | N/A | Beast Trojan |
| 155 | TTKGP | TatukGIS | TatukGIS Project Format |
| 156 | TTY | Adobe Systems Incorporated | Macromedia Dreamweaver |
| 157 | TUB | Corel | Paint Shop Pro Picture Tube |
| 158 | TUR | Holt Software | Turing Program Source Format |
| 159 | TV | Corel Corporation | Corel Paradox Table View Settings |
| 160 | TV1 | Corel Corporation | Corel WordPerfect Overflow |
| 161 | TV2 | Corel Corporation | Corel WordPerfect Overflow |
| 162 | TV3 | Corel Corporation | Corel WordPerfect Overflow |
| 163 | TV4 | Corel Corporation | Corel WordPerfect Overflow |
| 164 | TV5 | Corel Corporation | Corel WordPerfect Overflow |
| 165 | TV6 | Corel Corporation | Corel WordPerfect Overflow |
| 166 | TV7 | Corel Corporation | Corel WordPerfect Overflow |
| 167 | TV8 | Corel Corporation | Corel WordPerfect Overflow |
| 168 | TV9 | Corel Corporation | Corel WordPerfect Overflow |
| 169 | TVN | N/A | Yamaha Tyros 2 Voice |
| 170 | TWAIN | Adobe Systems Incorporated | Adobe Acrobat TWAIN 1.8 Specification |
| 171 | TWF | Esri | ArcView World Coordinates |
| 172 | TWIG | Sensio Labs | Twig Source |
| 173 | TX8 | N/A | 8-bit DOS ASCII Text |
| 174 | TXD | Renderware | Game Texture Dictionary |
| 175 | TXE | N/A | Enriched Text |
| 176 | TXF | STAR Group | Tax Exchange Format |
| 177 | TXH | Bram Moolenaar | Light Markup Language Text |
| 178 | TXL | N/A | Genesis3D Texture |
| 179 | TXML | N/A | Generic |
| 180 | TXT | N/A | Plain Text Format |
| 181 | TXT12 | N/A | IRI Scouting Database XML |
| 182 | TXTR | N/A | The Sims Texture |
| 183 | TXTRPT | CommScope | CommScope Teletilt Control System Report |
| 184 | TXW | N/A | Yamaha TX16W Audio Format |
| 185 | TXZ | Tukaani | XZ Compressed Tar Archive |
| 186 | TZ | N/A | Zipped Tar Archive |
| 187 | TZX | N/A | ZX Spectrum Tape Image Format |
