| dfv | Microsoft Word Print Format Template |
| dfw | Derive for Windows Data |
| dfw | SmartWare Cross-Tab Definition File |
| dfx | qs-STAT Q-DAS Value File |
| dfx | SmartWare Relate Definition File |
| dfxml | Digital Forensics XML |
| dgb | Digitarch FlashCAD Drawing Database |
| dgdb | Data Guardian Database |
| dgf | DUNE Grid Format File |
| dgi | HDConvertToX Input |
| dgimglib | DigiGuide Image Library |
| dgl | DigiGuide Language Data |
| dgmarker | DigiGuide Marker Data |
| dgnlib | Bentley MicroStation Design Library |
| dgo | Dell EqualLogic Diagnostic Log |
| dgp | Creator Generated Waveform |
| dgprint | DigiGuide Print Template |
| dgscheme | DigiGuide TV Scheme Data |
| dgscript | DigiGuide Script |
| dgtoolbar | DigiGuide Toolbar Data |
| dgz | Dega GZipped Saved State Data |
| dhg | Direct Hit Graphics Engine Output |
| dhl | Deepnet HTTP Server Log |
| dhs | HyperSnap Captured Drawing |
| dhx | Datamine Studio Data |
| diag | Microsoft Windows Troubleshooting Pack Designer Data |
| dic | Microsoft Office Custom Dictionary |
| dict | DICT Data File |
| did | Verity Server Index Data File |
| dii | AD Summation iBlaze Data |
| dil | DesignComposer Presentation Input Script |
| dim | Direct Internet Message Encapsulation Data |
| dime | Direct Internet Message Encapsulation Data |
| dip | DVDINFOPro Data |
| dipx | DVDINFOPro Data |