| stf | ALEID2000 Settings Data |
| stf | Microsoft Setup Table File |
| stp | Dart Pro 98 System Settings Data |
| stq | STATISTICA Text Data |
| strm | Plex Server Stream Settings Data |
| stskin | Steam Customizer Skin |
| sumocfg | SUMO Configuration |
| sup | Pro/ENGINEER Master Configuration |
| svp | SubViewer Preset Data |
| svs | Dart Pro 98 Spectral View Settings Data |
| svy | SmartQuest Survey Configuration Data |
| sw3 | WinWedge Configuration Data |
| swgo | Switch Go Configuration |
| sx2 | HPXView SONET/SDH Crossconnect Configuration |
| sxcu | ShareX Custom Uploader Configuration |
| sxp | Xen Configuration File |
| sxx | Adobe Flash Player Shared Object Settings File |
| sys | Windows System Configuration |
| t2c | TCP/Com Configuration |
| t4 | TerrAlign Alignment Configuration |
| tabletprefs | Wacom Tablet Preferences Backup |
| tam | Tame Settings |
| tbf | Cadvance Toolbar File |
| tbk | TQSL Configuration Backup |
| tbr | XMetaL Author Configuration Data |
| tccfgextender | TestComplete Tester-specific Settings Data |
| tci | TCINV Inversion Control File |
| tclogs | TestComplete Log Configuration File |
| tcls | TestComplete Configuration File |
| tcnet | TestComplete Configuration Reference File |
| tds | TerrAlign Dataset Configuration |
| tel | NCSA Telnet Configuration File |
| ter | CorelFlow Line Terminator Data |
| terminal | Terminal Settings Data |
| tf | Borland Turbo Configuration |
