| tbs | DB/TextWorks Persistent Scripting Information |
| tbu | DB/TextWorks Textbase User File |
| tbu | SDL Passolo Translation Bundle |
| tbv | Turbo-BrainVoyager Data |
| tbw | ModelSim Test Bench Waveform |
| tbx | TermBase eXchange Data |
| tc1 | GeoTide Harmonic Location Constants Data |
| tc2 | GeoTide Vector Stream Prediction Constants Data |
| tcap | HP OpenCall TCAP File |
| tcax | TestComplete Events Project Data |
| tcb | Tokyo Cabinet Database |
| tcdb | Tokyo Cabinet Database |
| tcdock | TestComplete Panel Layout Data |
| tce | STK Two-line Element Sets |
| tcf | Topocad Camber Diagram |
| tcg | Trading Card Game Data |
| tcia | TCIA Manifest Data |
| tckdt | TestComplete Keyword Test Data |
| tckdtest | TestComplete Single Keyword Test Data |
| tcllc | TestComplete Low-Level Procedures Collection Data |
| tcllp | TestComplete Single Low-Level Procedure Data |
| tclog | TestComplete Log File |
| tcmt | TestComplete Manual Tests Project Data |
| tcn | Hotword Connection Translator Source |
| tcnetsuite | TestComplete Network Suite Project Data |
| tcnm | TestComplete Name Mapping Project Data |
| tcnunit | TestComplete NUnit Test Data |
| tcodt | TestComplete Object-Driven Testing Project Data |
| tcs | Topocad Cross Sections |
| tcscript | TestComplete Script Project Data |
| tctas | TestComplete Tested Applications Project Data |
| tctbl | TestComplete Table Elements Data |
| tctbls | TestComplete Tables Settings Data |
| tctest | TestComplete Unit Test Data |
| tcusrfrm | TestComplete Single User Form Data |