| swt | Shockwave Flash Template |
| sxp | OpenOffice.org Script |
| syds | Essential Studio Data Sources Data |
| sydx | Syncfusion Dashboard Data |
| syp | SYP Script |
| sysml | Systems Modeling Language Document |
| systag | Android System Tag Data |
| syt | Sytes Template File |
| t | Tom Source Code |
| t | Turing Source Code |
| t2p | Tex2Page Macro Code |
| t3i | WebFOCUS TScom3 Script |
| t3o | WebFOCUS TScom3 Log |
| t6i | Mazak 640-MT Mazatrol Program |
| t6m | Matrix Mazatrol Program |
| taasmt | thinAir Assembly Template |
| tacls | Tangible Class Diagram |
| tacont | thinAir Console Template |
| taguit | thinBasic Debugger Data |
| targets | MSBuild Targets File |
| tastate | Tangible State Diagram |
| tb1 | Borland Turbo C Font Data |
| tbasic | thinBasic Script |
| tbasicc | thinBasic Console Script |
| tbasiccx | thinBasic Encrypted Console Script |
| tbasici | thinBasic Include Script |
| tbasicu | thinBasic Unit Script |
| tbasicx | thinBasic Encrypted Script |
| tbk | Visual FoxPro Memo Backup |
| tch | Turbo C Help |
| tcl | TCL Script |
| tco | MSX C Temporary Code |
| tcs | Tahoe Server Content Source |
| tcsh | TCSH Shell Script |
| tcv | SD Test Coverage Vector File |
