| .stwm |
SuperTux World Map File |
| .scratch |
Scratch Project File |
| .s2e |
SWF to EXE Converter Project File |
| .smo |
Sumotori Dreams Arena File |
| .txt |
Plain Text File |
| .tex |
LaTeX Source Document |
| .tsv |
Tab Separated Values File |
| .theme |
Microsoft Plus! Desktop Theme |
| .trs |
WinTrack Railroad Track Text File |
| .ts |
Video Transport Stream File |
| .tdl |
MathType Translator Definition Language |
| .toc |
PSP Audio File |
| .trk |
CompeGPS Land Track File |
| .tab |
Typinator Set File |
| .tscproj |
TechSmith Camtasia Project File |
| .text |
Plain Text File |
| .tpl |
Document Template |
| .tfw |
World File for TIFF |
| .tcl |
Tcl Script |
| .tst |
TestPoint Test File |
| .tdf |
Text Design File |
| .t3d |
Unreal Engine 3D Object File |
| .tdt |
FirstBreak Concrete Test File |
| .tcc |
TimeCalc Classic Data File |