| 1. | .dob | Visual Basic User document |
| 2. | .doc | Formatted text document (binary), very common (DisplayWrite, Interleaf, FrameMaker, FrameBuilder, Microsoft Word and Word2x, WordPerfect, WordStar) |
| 3. | .dog | Screen file (Laughing Dog Screen Maker) |
| 4. | .doh | Dependency information for .poh (Geoworks) |
| 5. | .doo | Music (Vibrants) |
| 6. | .dos | DOS related file (Win95) ◊ External command file (1st Reader) |
| 7. | .dot | Document template (Microsoft Word) ◊ Line-type definition file (CorelDraw) |
| 8. | .dox | Text document (MultiMate 4.0 - Microsoft Word) ◊ User document binary form (Visual Basic) |
| 9. | .doz | Description Out of Zip (VENDINFO) |
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