| dfa | SecuROM Manual Activation Request. |
| dfd | qs-STAT Q-DAS Description File |
| dfi | TI bqEASY Data Flash Image |
| dfp | Data Flask Package |
| dfq | SmartWare Query Definition File |
| dfq | qs-STAT Q-DAS Shared Data File |
| dfr | SmartWare Report Definition File |
| dfr | DataFlex Registration Data |
| dfs | SmartWare Sort Definition File |
| dfs | BrainSuite Surface |
| dft | EES Default Information |
| dft | SmartWare Transact Definition File |
| dfv | Microsoft Word Print Format Template |
| 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 |
