| tgf | Stonevoice Translator Tag Data |
| 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 |
| th2 | Cadfil Thickness Data |
| th2 | Therion TH2 Map |
| tha | Microsoft Windows Thai Noise-Words List |
| tha | Thunderbird MoreFunctionsForAddressBook Add-on Data |
| the | Microsoft Plus! Theme File |
| theme | Microsoft Windows Desktop Theme |
| themepack | Microsoft Windows 7 Theme Pack |
| thf | LS-DYNA Time History Database |
| thi | AbleCommerce Wizard Theme Index |
| thk | Cadfil Thickness Data |
| thm | Thunderbird MoreFunctionsForAddressBook Mailing Lists Data |
| thng | Component Manager for Mac Resource Data |
| thp | Intuit TurboTax Tax Line Description |
| ths | Corel WordPerfect Thesaurus Dictionary |
| thu | THUNDER Data |
| thumbdata | Android Thumbnail Data |
| thumbnail | Android Thumbnail Cache Data |
| thumbsdb | PixFiler Thumbnail Database |
