| dfw | Derive for Windows Data |
| dfw | SmartWare Cross-Tab Definition File |
| dfx | SmartWare Relate Definition File |
| dfx | qs-STAT Q-DAS Value File |
| dfxml | Digital Forensics XML |
| dgb | Digitarch FlashCAD Drawing Database |
| dgf | DUNE Grid Format File |
| dgi | HDConvertToX Input |
| dgl | DigiGuide Language Data |
| dgnlib | Bentley MicroStation Design Library |
| dgo | Dell EqualLogic Diagnostic Log |
| dgp | Creator Generated Waveform |
| dgz | Dega GZipped Saved State Data |
| dhcd | DHCD Computing Application Data |
| dhl | Deepnet HTTP Server Log |
| dhs | HyperSnap Captured Drawing |
| dht | GAUSS Data Set Header |
| 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 |
| dis | MSC Patran Displacement Results |
| disp | Altair OptiStruct Displacement Data |
| dist | PLINK Genomic Hamming Distance Matrix |
