| tfd | Tape Format Requirements Document |
| tfh | Borland Turbo Profiler Help Data |
| tfi | Sharing Transaction Fraud Data |
| tfields | Tome Editor Field Definition Data |
| tfil | World of Warcraft Software Update |
| tfl | ALKFLOW Total Flow Data |
| tfl | Trimble Field Link 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 |
| tfx | Avid Pro Tools Eleven Rack Presets |
| tfz | FBS Vehicle Database |
| tg2 | tg2htm Saved Metadata |
| tg3 | TexGen 3 Geometry Data |
| tgc | Terragen Clip File |
| tgd | Terragen 2 World |
| tgf | Stonevoice Translator Tag Data |
| tgf | libigl Control Handle Graphs |
| tgg | eMoflon Triple Graph Grammars Data |
| tgl | SkyMap Target Lists |
| tgmd | WDTV ThumbGen Movie Metadata |
| tgmg | TabGroups Manager for Firefox Exported Group Data |
| tgo | Terragen Object File |
| tgp | FM-ONE Target Protocol Data |
| tgs | GSTree Tree Data |
| tgw | FM-ONE Target Write-in Control Data |
| tgw | Terragen World |
| tgworld | Terragen World |
| th | Therion Data |
