| 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 |
| 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 |
| tia | Siemens TIA Portal Data File |
| tic | ArcInfo Coverage TIC |
| ticr | Amazon Kindle eBook Info |
| tidx | AACS Thumbnail Index File |
| tie | CrossOver v10 CrossTie Installer |
| tig | TI Connect Group File |
| tii | Lucene Term Info Index |
| tika | Apache Tika Data |
| time | Light Time |
| timg | Playground OSS Image Data |
| tin | WMS Triangulated Irregular Networks Data |
| tin | WRAP TABLES Input Data |
| tinf | Microsoft Windows Theme Info |
| tiny | Gnome Desktop Tiny Data |
| tiq | Tektronics RSA306 TIQ Data |
| tis | Lucene Term Infos |
| tit | Novapoint Horizontal Alignment Data |
| tit | CXTerm Text Input Table |
