| 1. | .df | Bitmap graphics (Hierarchical Data File) (NCSA) |
| 2. | .dfd | Data Flow Diagram graphic (Prosa) ◊ Dyadic functions (ABC programming language) |
| 3. | .dfi | Outline font description (Digifont) |
| 4. | .dfl | Default program settings (Signature) |
| 5. | .dfm | Data Flow Diagram model file (Prosa) ◊ Form file (Borland Delphi - Borland C++ Builder) |
| 6. | .dfs | Delight Sound File |
| 7. | .dfv | Printing form (Microsoft Word) |
| 8. | .dfx | Micrografx Effects DLL |
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