| dfr | DataFlex Registration Data |
| dfr | SmartWare Report Definition File |
| dfs | Autodesk AutoCAD Utility Defaults Data |
| dfs | BrainSuite Surface |
| dfs | SmartWare Sort Definition File |
| dfs | Swirlique Data |
| dfs2 | MIKE 11 Results Data |
| dft | BullsEye Style Sheet |
| dft | EES Default Information |
| dft | eJuice Me Up Default Settings Data |
| dft | SmartWare Transact Definition File |
| dft | Workshare Synergy DFT Data |
| dfu | LaTeX Font Encoding Data |
| dfv | Microsoft Word Print Format Template |
| dfw | Derive for Windows Data |
| dfw | SmartWare Cross-Tab Definition File |
| dfx | Micrografx Designer Effects Data |
| dfx | qs-STAT Q-DAS Value File |
| dfx | SmartWare Relate Definition File |
| dfxml | Digital Forensics XML |
| dg-key | DigiGuide Key Data |
| dgb | Digitarch FlashCAD Drawing Database |
| dgc | DigiGuide Channel Extension |
| dgcr | DigitalGCodecArchiver Data |
| dgdb | Data Guardian Database |
| dgf | DUNE Grid Format File |
| dgi | HDConvertToX Input |
| dgimglib | DigiGuide Image Library |
| dgl | DigiGuide Language Data |
| dgl | DynaGeo License Data |
