| ded | Dr. Engrave Document |
| des | Intuit QuickBooks Template |
| design | Microsoft Expression Design Drawing |
| dfb | Data Flask Formula |
| dfd | Silverrun DFD Document |
| dff | RenderWare 3D Model |
| dfg | Data Flask Grid |
| dfm | Help and Manual eBook Template |
| dft | Solid Edge Draft Document |
| dfti | FlexiWrite Document |
| dfx | Softdesk Drafix CAD Document |
| dg | Auto-trol Tech Illustrator Drawing |
| dg3 | DeltaGraph Document |
| dgk | Delcam 3D Model |
| dgm | Autodesk AutoCAD Civil 3D DGM Document |
| dgm | Lotus Freelance Graphics Diagram |
| dgn | Bentley MicroStation Drawing |
| dgs | Dagesh Pro Document |
| dhw | ACECAD DigiMemo Memo Document |
| dia | Dia Diagram |
| dif | Data Interchange Format |
| diz | Archive Description |
| djc | RootPro CAD Document |
| dma | IBM Rational DOORS Template |
| dmf | Delgine DeleD Model File |
| dmz | DMesh 3D Model |
| doc | Corel WordPerfect Document |
| doc | Microsoft Word Document |
| doc | WordStar 2000 Document |
| docb | XXE Docbook Document |
| dochtml | Microsoft Word HTML Document |
| docm | Microsoft Word 2007 Document |
| docmhtml | Microsoft Word 2007 HTML Document |
| doct | OnlyOffice Internal DOCX Document |
| docx | Microsoft Word 2007 Document |
