| thk | Cadfil Thickness Data |
| thm | Thunderbird MoreFunctionsForAddressBook Mailing Lists Data |
| thng | Component Manager for Mac Resource Data |
| thnl | Graphics Workshop Professional Thumbnail |
| 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 |
| tifenx | Egis Encrypted TIFF Data |
| tiffenx | Egis Encrypted TIFF Data |
| tifx | Egis Encrypted TIFF Data |
| tig | TI Connect Group File |
| tii | Lucene Term Info Index |
| tiip | DXF-TIIP Pattern Data |
| tika | Apache Tika Data |
| time | Light Time |
| timg | Playground OSS Image Data |
| tin | Carlson 2016 Triangulated Irregular Network Data |
| tin | WRAP TABLES Input Data |
| tin | WMS Triangulated Irregular Networks Data |
| tinf | Microsoft Windows Theme Info |
| tiny | Gnome Desktop Tiny Data |
| tiq | Tektronics RSA306 TIQ Data |
