| ttx | WinTTX Teletext Data |
| ttx | Trados TagEditor File |
| tt_ | Compressed TTF File |
| tud | ThumbsPlus Graphics Database |
| tudb | AVG PC TuneUp Database |
| tue | Mozilla Firefox Bookmark Backup |
| tuf | Microsoft SQL Server Transaction Undo File |
| tun | Wusikstation Microtuning Data |
| turbo | Intuit TurboTax Related Data |
| tuw | Microsoft Office Installer Control File |
| tux | Tutorix Tutorial Data |
| tv | Paradox Table Property File |
| tva | TrueVision3D Model |
| tvants | TVAnts Data |
| tvd | Lucene Term Vector Documents |
| tvf | Lucene Term Vector Fields |
| tvf | Topcon Link Vector Data |
| tvgskin | TVgenial Skin |
| tvixie | TViXiE Data |
| tvlayer | BoinxTV TV Layer |
| tvm | TrueVision3D Morph Target |
| tvp | Nvidia NView Desktop Profile |
| tvpi | TitanTV Television Listing |
| tvq | EasyNN-plus Data |
| tvr | VMware ThinApp Virtual Registry Data |
| tvrecording | BoinxTV TV Recording |
| tvshow | BoinxTV TV Show |
| tvt | ThinkVantage Rescue and Recovery File |
| tvvi | TitanTV Television Program Data |
| tvx | Lucene Term Vector Index |
| tw0 | Native Instruments B4 II Tonewheel Data |
| twb | Tableau Workbook |
| twbx | Tableau Packaged Workbook |
| twe | ThinkWave Educator Data |
| twf | TabWorks Data File |