| 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 |
| dict | Microsoft Virtual PC Dictionary Data |
| dict | Spellswell Dictionary |
| dict | Sunnysoft InterWrite Dictionary Data |
| did | Verity Server Index Data File |
| dif | MAME CHD Diff Data |
| dif | OS/2 Warp Display Information |
| dii | AD Summation iBlaze Data |
| dii | TrialDirector Load Data |
| dil | DesignComposer Presentation Input Script |
| dil | WordExpress DIL Data |
| dim | Adobe Dimension Geometry 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 |
| dis | CorelDraw Thesaurus Dictionary |
| dis | DATAIR Data Import Specification Layout |
| dis | MODFLOW Discretization Package |
| dis | MSC Patran Displacement Results |
