| 1. | .dia | Diagraph graphics (Computer Support Corporation) |
| 2. | .dib | Bitmap graphics (Device Independent Bitmap) |
| 3. | .dic | Bitmap graphics (DICOM Digital Imaging and Communations in Medicine format) ◊ Dictionary (Lotus Notes, Lotus Domino) |
| 4. | .dicom | Bitmap graphics (DICOM Digital Imaging and Communations in Medicine format) |
| 5. | .dif | Bitmap graphics (Raytheon Raster) ◊ Database (Data Interchange Format) ◊ Difference data file (Patch script) ◊ Display Information File (OS/2) ◊ Video |
| 6. | .diff | Difference data file (Patch script) |
| 7. | .dig | Sound (Digilink format) (Sound Designer I) |
| 8. | .dip | Debug info processor (Watcom Debugger) ◊ Graphics file |
| 9. | .dir | Dialing directory file (Procomm Plus) ◊ Directory file (VAX - CPS Backup) ◊ INFO directory manager file (ArcView) ◊ Movie format (MacroMind Director 4.x) |
| 10. | .dis | Distribution database (Mobius) ◊ Distribution list (VAX Mail) ◊ Graphics (Raytracer file) ◊ Thesaurus (CorelDraw) |
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