| tt2012state | TurboTax 2012 State Tax Form |
| ttb | Railway Operation Simulator Timetable Data |
| ttbk | Intuit TurboTax Canada 2010 Backup Data |
| ttbs | Microsoft PowerPoint for Mac Toolbar Data |
| 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 |
| ttrec | SIMATIC Recorded Trace Data |
| ttrecx | SIMATIC Recorded Trace Data |
| ttsm | TTS Turbo Macros Data |
| ttsystem | TomTom System Update Data |
| ttv | TempTale Manager Desktop Data |
| ttvf | PlainTalk Voice Data |
| ttx | Crystal Reports Data Connection |
| ttx | TempTale4 USB Encrypted Data |
| ttx | Trados TagEditor File |
| ttx | WinTTX Teletext Data |
| tty | Adobe Dreamweaver TTY Data |
| ttypes | Tome Editor Custom Types 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 |
| tun | Wusikstation Microtuning Data |
| turbo | Intuit TurboTax Related Data |
| tuw | Microsoft Office Installer Control File |
