| 1. | .td | Configuration file (Turbo Debugger for DOS) |
| 2. | .td0 | Disk image (compressed diskette in a file) (Teledisk) |
| 3. | .td2 | Configuration file (Turbo Debugger for Win32) |
| 4. | .td4 | Saved track design (Roller Coaster Tycoon) |
| 5. | .tdb | Database (TACT) ◊ Database file (Thumbs Plus) ◊ Layout database (Tanner Ledit) |
| 6. | .tddd | Imagine Object File Format (ray-tracer) |
| 7. | .tdf | Font (TheDraw) ◊ Typeface definition file (Speedo) |
| 8. | .tdh | Help file (Turbo Debugger) |
| 9. | .tdi | Bitmap graphics (animation) (24bit truecolor Explore TDI image by Alias/Wavefront Explore) |
| 10. | .tdk | Keystroke recording file (Turbo Debugger) |
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