| tas | ADRIFT Text Adventure Save |
| tat | Topocad Attributes Data |
| tav | TIGR Array Viewer Format Data |
| tavg | POP Time-averaged History Data |
| tax | Intuit TurboTax Data |
| tax08 | Intuit TurboTax 2008 Tax Return Data |
| tax2008 | Intuit TurboTax 2008 Tax Return Data |
| taxform | Intuit QuickBooks Draft Data |
| tb | Tabbery Tab |
| tb0 | Adobe Photoshop Thumbnail Cache |
| tb2 | TASBooks 2 Company Data Backup |
| tb3 | Intel VTune Performance Monitor Sampling Data |
| tba | DB/TextWorks Primary Textbase Definition |
| tbb | DB/TextWorks Textbase Structure Definition |
| tbb | The Bat! Message Base |
| tbc | Toon Boom Studio Catalog Data |
| tbcp | Toon Boom Studio Color Palette Data |
| tbd | Visual Studio Toolbox Data |
| tbg | TeamBG Exported Data |
| tbi | The Bat! Message Index |
| tbio | Toxic Biohazard Presets Data |
| tbk | DBase Memo Backup Data |
| tbl | ArcVIEW Geocode Support Table |
| tbl | Pro/ENGINEER Table |
| tbm | Tableau Bookmark Data |
| tbo | Turbo Architecture Database |
| tbr | Norton Desktop Custom Toolbar |
| tbs | DB/TextWorks Persistent Scripting Information |
| tbu | SDL Passolo Translation Bundle |
| tbu | DB/TextWorks Textbase User File |
| tbv | Turbo-BrainVoyager Data |
| tbw | ModelSim Test Bench Waveform |
| tbx | TermBase eXchange Data |
| tc1 | GeoTide Harmonic Location Constants Data |
| tc2 | GeoTide Vector Stream Prediction Constants Data |