| 21. | .tbf | Fax (Imavox TurboFax) |
| 22. | .tbk | Memo backup (dBASE IV - FoxPro) ◊ Toolbook (Asymetrix ToolBook) |
| 23. | .tbl | Dynamic Link library ◊ Graphics (Native format) (Pagemaker TableEditor) ◊ Table ◊ geocoding support table (ArcView) |
| 24. | .tbr | Custom toolbar (Norton Desktop) |
| 25. | .tbs | Text elements (Textbausteine) (German Microsoft Word) |
| 26. | .tbx | Table (Project Scheduler 4) |
| 27. | .tc | Configuration (Turbo C - Borland C++) ◊ Termcap |
| 28. | .tch | Help file (Turbo C - Borland C++) |
| 29. | .tcl | Tcl/Tk (Tool Command Language) script source code |
| 30. | .tco | T9000 object modules |
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