| dgst | OpenSSL Message Digest Data |
| dgtoolbar | DigiGuide Toolbar Data |
| dgz | Dega GZipped Saved State Data |
| dhcd | DHCD Computing Application Data |
| dhg | Direct Hit Graphics Engine Output |
| dhl | Deepnet HTTP Server Log |
| dhs | HyperSnap Captured Drawing |
| dht | GAUSS Engine Data Set Header |
| dhx | Datamine Studio Data |
| dhy | Adobe Bridge Data |
| diag | Microsoft Windows Troubleshooting Pack Designer Data |
| dialog | UltraEdit Dialog Data |
| dialog | Zoom Player Dialog Texts Data |
| dic | Microsoft Office Custom Dictionary |
| dicproof | Microsoft Word Dictionary Proofing Data |
| dict | DICT Data File |
| did | Verity Server Index Data File |
| dii | AD Summation iBlaze Data |
| dii | TrialDirector Load Data |
| dil | DesignComposer Presentation Input Script |
| dil | WordExpress DIL Data |
| dim | Direct Internet Message Encapsulation Data |
| dim | TripleSat DIMAP Data |
| dime | Direct Internet Message Encapsulation Data |
| din | WRAP DAY Input Data |
| dinfo | DivX Temporary Video Info |
| dip | DVDINFOPro Data |
| dipx | DVDINFOPro Data |
| dir | Procomm Plus Dialing Directory |
| dir00 | Windows Disk Defag Error Dump |
