| tsk | Petrosys Task List |
| tsk | PhotoImpact Commands Data |
| tsk | Task Coach Data |
| tsk | TTPod Skin |
| tsks | XviD4PSP Tasks Data |
| tsm | TINA Subcircuit Macro |
| tsm | Turbo Assembler for OS/2 Manual |
| tsmagenda | TSM Agenda Data |
| tso | The Studio Organizer Data |
| tspub | Windows Server Terminal Services RemoteApp Data |
| tst | LinkWare Test Database |
| tst | Pro/ENGINEER Test Results Data |
| tst | RPG Toolkit Tile Data |
| tst | TagScanner Text Transform Script |
| tst | TestPoint Test Data |
| tst | Topocad Section Template |
| tstest | Telerik Test Studio Test Definitions File |
| tstream | SwarmPlayer Streaming Torrent |
| tsv | NanoDrop Legacy Data |
| tsv | Topcon TopSURV v6 Job |
| tsw | NI TestStand Workspace |
| tsx | Tiled Tile Set XML |
| tsy | Topocad Symbols Data |
| tsz | Trillian Skin File |
| tt10 | Intuit TurboTax Canada 2010 Tax Return Data |
| tt11 | Intuit TurboTax Canada 2011 Tax Return Data |
| tt12 | Intuit TurboTax Canada 2012 Tax Return Data |
| tt13 | Intuit TurboTax Canada 2013 Tax Return Data |
| tt14 | Intuit TurboTax Canada 2014 Tax Return Data |
| tt15 | Intuit TurboTax Canada 2015 Tax Return Data |
