| tt2012state | TurboTax 2012 State Tax Form |
| ttbk | Canadian TurboTax 2010 Backup |
| ttd | Tinytag Data Logger Data |
| ttf | Altera Tabular Text File |
| tti | Teletext Page Document |
| ttl | Tera Term Macro |
| ttn | Bentley InRoads Topologically Triangulated Network Data |
| tto | IBM AS/400 Transfer Request |
| ttrecx | SIMATIC Recorded Trace Data |
| ttsm | TTS Turbo Macros Data |
| ttv | TempTale Manager Desktop Data |
| ttx | Trados TagEditor File |
| ttx | WinTTX Teletext Data |
| 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 |
| tuw | Microsoft Office Installer Control File |
| tv | Paradox Table Property File |
| tva | TrueVision3D Model |
| 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 |
