| tdump | JIRA Thread Dump |
| tdv | NI Diadem Layout |
| te | Textease Database CT Single-user Database |
| te1 | UltraEdit Template |
| te3 | WinTrack Object File |
| tea | TEA Encrypted Data |
| teacher | SMART Response Teacher Database |
| tec | TECkit Compiled Mapping Table |
| tei | Text Encoding and Interchange Data |
| tei | TrackEye Image Sequence Data |
| tek | Tektronix HEX Data |
| teo | TruTops Tube Data |
| teq | TINA Equation File |
| ter | Terragen Terrain File |
| term | Apple Terminal Data |
| terrain | Terragen Terrain File |
| terrn | Rigs of Rods Terrain Data |
| terrn2 | Rigs of Rods Terrain Data |
| tet | Textease Database CT Single-user Database Template |
| tew | Bentley InRoads Text Export Wizard Data |
| tex0 | Nintendo Wii Texture Data |
| texb | Playground OSS Texture Data |
| texport | Tome Editor Export Template Data |
| texter | Texter Snippet Data |
| textfactory | BBEdit Text Factory Data |
| tf10 | IRIG 106 Data Transfer Data |
| tfa | TreeSoft CashFlow Analysis Data |
| tfam | PLINK Individual Information File |
| tfh | Borland Turbo Profiler Help Data |
| tfields | Tome Editor Field Definition Data |
| tfl | ALKFLOW Total Flow Data |
| tfl | Tific Client Data |
| tfr | 4D Database Windows Formula Document |
| tfrm | 4D Database Mac OS X Formula Document |
| tfv | YETI Vegetation Plot Database Export File |