| tbo | Turbo Architecture Database |
| tbr | Norton Desktop Custom Toolbar |
| tbs | DB/TextWorks Persistent Scripting Information |
| tbu | SDL Passolo Translation Bundle |
| tbu | DB/TextWorks Textbase User File |
| tbv | Turbo-BrainVoyager Data |
| tbw | ModelSim Test Bench Waveform |
| tbx | TermBase eXchange Data |
| tcap | HP OpenCall TCAP File |
| tcax | TestComplete Events Project Data |
| tcb | Tokyo Cabinet Database |
| tcdb | Tokyo Cabinet Database |
| tce | STK Two-line Element Sets |
| tcf | Topocad Camber Diagram |
| tcg | Trading Card Game Data |
| tclog | TestComplete Log File |
| tcn | Hotword Connection Translator Source |
| tcs | Topocad Cross Sections |
| tcvis | TestComplete Test Visualizer Index |
| tcx | Tacx Exported Training Data |
| tczip | Tekla Structures Exported Data |
| tda | Palm To-Do Archive |
| tdb | SlamDB Database |
| tdc | Tableau Data-connection Customization File |
| tddd | Imagine 3D Data Description File |
| tde | Tableau Data Extract |
| tdf | DVD X Copy TDF File |
| tdf | Guide Text Definition File |
| tdh | Borland Turbo Debugger Help Data |
| tdo | Xilinx Text Design Output |
