| Extension | Description | File Type |
|---|
| t | Parasolid Model File | 3D Files |
| ta0 | TaxAct File | Data Files |
| tab | Tablature Files | Text Files |
| tag | DataFlex Query Tag File | Misc Files |
| tak | TAK File | Audio Files |
| tar | Compressed Tape Archive File | Data Files |
| targets | MSBuild Targets File | Developer Files |
| tax | Turbotax File | Misc Files |
| tbk | FoxPro Memo Field Backup File | Data Files |
| tbk | SumTotal Toolbook File | Multimedia Files |
| tbl | Adobe Pagemaker Table File | Layout Files |
| tcf | Topocad Camber Form File | Geographical Files |
| tcs | Topocad Cross Section File | Geographical Files |
| td | Borland Debugger Configuration File | Developer Files |
| tdb | eBay Turbo Lister File | Backup Files |
| tdl | MathType Translator File | Misc Files |
| tdt | Thor Datatree File | Data Files |
| tdtm | Topocad Digital Terrain Model File | Geographical Files |
| tec | Tecplot Analysis File | Data Files |
| temp | Temporary File | Misc Files |
| test | Test File Extension | Misc Files |
| tex | LaTeX Source Document File | Text Files |
| text | ASCII Text File | Text Files |
| tga | Truevision Targa Graphic File | Graphic Files |
| tgz | Gzip Tar Archive File | Archived Files |
| themepack | Windows 7 Themepack File | Settings Files |
| thm | Thumbnail Image File | Graphic Files |
| tib | Acronis True Image File | Disk Image Files |
| tif | Tagged Image File | Graphic Files |
| tiff | Tagged Image File Format | Graphic Files |
| tlb | OLE Type Library | Misc Files |
| tmb | Panasonic Camcorder Information File | Misc Files |
| tmb | Movie Magic Screenwriter Backup File | Misc Files |
| tmp | Temporary File | Backup Files |
| tmpl | eMule Web Interface Template File | Web Files |
| tna | Topocad Net Adjustment File | Geographical Files |
| tns | TI-Nspire Document | 3D Files |
| tns | TNS File | Encrypted Files |
| toast | Roxio Toast Image File | Disk Image Files |
| toc | PSP Audio File | Audio Files |
| top | Topocad Drawing File | Geographical Files |
| torrent | Torrent | Misc Files |
| tp | Turbo Pascal Configuration File | Developer Files |
| tpc | Topocad Pointcloud File | Geographical Files |
| tpf | HiJaak PCL Soft Font File | Fonts Files |
| tpf | Topocad Profile Form File | Geographical Files |
| tpi | Microsoft Test File | Misc Files |
| tpl | Document Template File | Misc Files |
| tpp | Teleport Pro Project File | Web Files |
| tps | Multi Channel Measurement File | Data Files |
| tps | Clarion TopSpeed Data File | Data Files |
| tptb | Compressed Game File | Misc Files |
| trashes | Google Android Mobile Phone File | Misc Files |
| trashinfo | Trashcan Metadata File | System Files |
| trl | Topocad Road Line File | Geographical Files |
| trp | Topocad Road Profile File | Geographical Files |
| trp | High Definition Video Transport Stream File | Encoded Files |
| trx | Router Firmware File | Settings Files |
| ts | Transport Stream File | Video Files |
| tsk | Windows Mobile Theme File | Misc Files |
| tst | Topocad Template File | Geographical Files |
| tsv | Tab Separarted Value File | Text Files |
| tt10 | Turbotax 2010 return File | Misc Files |
| tta | The True Audio Codec File | Audio Files |
| ttf | TrueType Font | Fonts Files |
| ttu | Topocad Tunnel Cross Section File | Geographical Files |
| tun | Topocad Tunnel Section Template File | Geographical Files |
| tvr | Navicat for MySQL File | Data Files |
| tw | TW File | Data Files |
| txd | Game Texture Dictionary | Game Files |
| txt | Text Files | Text Files |