| Abbreviation | Definition |
|---|---|
| DGS | Diagnostics |
| DH | Dependency information for .ph (Geoworks) |
| DHE | Help Workshop Dialog Box Help Editor Document |
| DHP | Dr. Halo Picture file |
| DHT | Datafile (Gauss) |
| DIA | Diagraph graphics (Computer Support Corporation) |
| DIB | Device Independent Bitmap file (Bitmap graphics) |
| DIC | Dictionary |
| DICM | Danish Intellectual Capital Management |
| DIF | Data Interchange Format - Database |
| DIF | Digitally Improvized Format |
| DIF | OS/2 Display Information File |
| DIF | Patch script DIFference data file |
| DIFF | Difference data file (Patch script) |
| DII | Dynamic Invocation Interface |
| DIP | Watcom Debugger Debug Info Processor |
| DIP | Watcom Debugger Debug Info Processor |
| DIR | Directory file |
| DIR | MacroMind Director Movie format |
| DIR | Procomm Plus Dialing DIRectory file |