| 101. | .dmd | Data Module (Visual dBASE) |
| 102. | .dmf | Music format (Delusion Digital Music File) (Delusion) ◊ Packed Amiga disk image |
| 103. | .dmo | Demo (Derive) |
| 104. | .dmp | Dump file (eg. screen or memory) |
| 105. | .dms | Compressed Amiga file archive (DiskMasher) |
| 106. | .dna | Distributed Network Application info (NewMoon) |
| 107. | .dob | Visual Basic User document |
| 108. | .doc | Formatted text document (binary), very common (DisplayWrite, Interleaf, FrameMaker, FrameBuilder, Microsoft Word and Word2x, WordPerfect, WordStar) |
| 109. | .dog | Screen file (Laughing Dog Screen Maker) |
| 110. | .doh | Dependency information for .poh (Geoworks) |
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