| 31. | .tcsh | Unix shell script (tcsh) |
| 32. | .tcw | Drawing (TurboCAD for Windows) |
| 33. | .td | Configuration file (Turbo Debugger for DOS) |
| 34. | .td0 | Disk image (compressed diskette in a file) (Teledisk) |
| 35. | .td2 | Configuration file (Turbo Debugger for Win32) |
| 36. | .td4 | Saved track design (Roller Coaster Tycoon) |
| 37. | .tdb | Database (TACT) ◊ Database file (Thumbs Plus) ◊ Layout database (Tanner Ledit) |
| 38. | .tddd | Imagine Object File Format (ray-tracer) |
| 39. | .tdf | Font (TheDraw) ◊ Typeface definition file (Speedo) |
| 40. | .tdh | Help file (Turbo Debugger) |
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