| 1. | .$d$ | Data (OS/2 Planner) |
| 2. | .d2d | 2D/3D object file (3-D Fassade Plus) |
| 3. | .d64 | Commodore 64 emulator disk file |
| 4. | .dac | Sound (TI/MIT DAC format) (byte reversed ADC file) |
| 5. | .daf | Document archive (Mobius) |
| 6. | .dao | Windows Registry Backup |
| 7. | .dap | Data access page (Microsoft Access 2000) |
| 8. | .dat | Data file (ASCII or binary) (very common) ◊ Error message in inbound internet email message (Microsoft Exchange Server) ◊ MPEG file ◊ Merge data (WordPerfect) |
| 9. | DANTE | Delivery of Advanced Network Technology to Europe See also: Delivery of Advanced Network Technology to Europe |
| 10. | DARPA | Defense Advanced Research Projects Agency See also: Defense Advanced Research Projects Agency |
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