| tdr | Physical Layer Test System Calibration Data |
| tdr | TINA Diagram Results |
| tds | Adobe LiveCyle Designer Template |
| tds | Tableau Data Source |
| tdsp | Windows Media Player TDSP Data |
| tdsx | Tableau Packaged Data Source |
| tdt | PLINK Transmission Disequilibrium Test Report |
| tdt | THOR Datatree File |
| tdt1 | AACS Thumbnail Data File |
| tdt2 | AACS Thumbnail Data File |
| tdtm | Topocad Tunnel Terrain Models Data |
| tdump | JIRA Thread Dump |
| tdv | NI Diadem Layout |
| tdx | NI Diadem TDX Data |
| te | Textease Database CT Single-user Database |
| te1 | UltraEdit Template |
| te3 | WinTrack Object File |
| tea | TEA Encrypted Data |
| teacher | SMART Response Teacher Database |
| tec | Android TEC Thumbnail Data |
| tec | Tanner EDA L-edit Layout Data |
| tec | TECkit Compiled Mapping Table |
| tec | TECO Macro Data |
| tec | Tecplot ASCII Data |
| ted | Topocad Export Data |
| tei | Text Encoding and Interchange Data |
| tei | TrackEye Image Sequence Data |
| tek | ASITIC Technology Data |
| tek | Tektronix HEX Data |
| tem | Badge Designer 2000 Template |
