| thc | Therion Configuration File |
| timer | Systemd Service Timer Configuration |
| tiw | Bentley InRoads Wizard Settings Data |
| tlp | Tunnelier Profile |
| tlset | Text Locker Settings |
| tmap | TI PowerLAN Configuration |
| tn7 | Casio WK-3000 User Tones |
| toe | TouchDesigner Environment |
| tofp | Toshiba Fingerprint Utility Settings |
| tol | Zemax Tolerance Settings |
| tprc | Terminal-Plus Script |
| tps | Treepad Settings File |
| trm | Terminal Settings |
| tsi | NI Traktor Settings File |
| tsm | TwinCAT System Manager Configuration |
| ttcfgx | SIMATIC Trace Configuration Data |
| tvc | TeamViewer Configuration |
| tvf | dBASE Table View Settings |
| twc | TTWin Configuration File |
| twn | TwinCalc Settings |
| twn | OP9630 Scanner Settings |
| twrps | TWRP Settings |
| txr | CorelDRAW Graphics Custom Settings Data |
| typeit4me | TypeIt4Me Clippings |
| tzi | Windows CE Time Zone Information |
| uae | WinUAE Configuration |
| uav | OpenPilot UAV Settings Data |
| ubb | BEA eLink Adapter Configuration |
| ubr | Web Capacity Analysis Tool Settings |
| uchr | Apple iOS Keyboard Layout |
| ucp | SmartWare Communications Profile |
| udc | Universal Data Connection |
| udcx | Universal Data Connection |
| uec | UltraEdit Saved Settings |
| ufi | UFOCapture V2 Settings |