| dfx | Softdesk Drafix CAD Document |
| dg | Auto-trol Tech Illustrator Drawing |
| Tekla Xsteel Drawing |
| dg3 | DeltaGraph Document |
| dgk | Delcam 3D Model |
| dgm | Autodesk AutoCAD Civil 3D DGM Document |
| Lotus Freelance Graphics Diagram |
| Lotus Freelance Graphics Diagram Data |
| dgn | Bentley MicroStation Drawing |
| dgpd | DeltaGraph Document |
| dgr | DeltaGraph Document |
| dgrh | DeltaGraph for Mac Document |
| dgs | Dagesh Pro Document |
| dhtml | Dynamic HTML Data |
| dhw | ACECAD DigiMemo Memo Document |
| dia | Dia Diagram |
| Psion Organiser Diary Document |
| dif | Data Interchange Format |
| dio | Draw.io Diagram Document |
| dip | DipTrace PCB Document |
| dis | Oracle Discoverer Workbook |
| discomap | DISCO Discovery Output |
| diz | Archive Description |
| djc | RootPro CAD Document |
| dk | Danish Language Info File |
| dlst | DLsite Viewer Document |
| dma | IBM Rational DOORS Template |
| dmf | Delgine DeleD Model File |
| dmm | iMindQ 3.0 Mind Map Document |
| dmmt | iMindQ Mind Map Template |
| dmmw | iMindQ Mind Map Workbook |
| dmmx | iMindQ Mind Map Document |
| dmz | DMesh 3D Model |
| doc | Corel WordPerfect Document |
| Microsoft Word Document |
| WordStar 2000 Document |
| docb | XXE Docbook Document |
| doce | Document Manager Encrypted Word Document |
| dochtml | Microsoft Word HTML Document |
| docl | Document Manager Locked Word Document |
| docm | Microsoft Word 2007 Document |
| docmhtml | Microsoft Word 2007 HTML Document |
| doct | OnlyOffice Internal DOCX Document |
| docx | Microsoft Word 2007 Document |
| docxl | Document Manager Locked Word Document |
| docxml | Microsoft Word XML Document |
| docz | ThinkFree Online Note Document |
| dor | Digita Organiser Diary |
| dot | Graphviz DOT File |
| Microsoft Word Document Template |
| Nisus Writer Pro Template |
| dothtml | Microsoft Word HTML Document Template |
| dotm | Microsoft Word 2007 Template |
| dotx | Microsoft Word 2007 Template |
| dox | MultiMate Document |
| dpa | DrawPlus Animation |
| dpb | Caere FaxMaster Document |
| dpd | Ovation Pro Document |
| dpo | DECAdry Express Business Cards Document |
| dpro | MacDraw Pro Drawing |
| dps | Kingsoft Presentation Document |
| Ovation Pro Style Sheet |
| dpso | WPS Office Presentation Outward Document |
| dpt | Kingsoft Presentation Template |
| dpx | DrawPlus Drawing Template |
| dqy | Microsoft Excel Database Query |
| dr4 | AllyCAD Drawing Document |
| dra | Cadence OrCAD Component Footprint |
| Dolphin PartMaster Drawing Document |
| Scriptor Script |
| draw | RISC OS Vector Drawing |
| drawio | Draw.io Diagram Document |
| drd | PL Designer Document |
| drf | Autodesk 3D Scene |
| PC Draft v4 Drawing |
| drg | AllyCAD Drawing Document |
| drm | Drumlin Secure PDF File |
| drmx | Drumlin Fully Secure PDF File |
| drmz | Drumlin Fully Secure Mobile PDF File |
| drn | DRAKON Editor diagram |
| drp | DReport Document |
| drt | Micrografix Windows Draw Template |
| drw | ANVIL-1000MD Drawing |
| Micrografx Designer Drawing |
| PTC Creo Drawing Document |
| RISC OS Vector Drawing |
| drwdot | SolidWorks Drawing Template |
| drwg | MacDraw Drawing |
| ds4 | Micrografx Designer Document |
| dsc | Design Science Equation Editor Data |
| dsd | Autodesk Drawing Set Description |
| dsf | Micrografx Designer Document |
| Microsoft Belief Network Document |
| dsg | Control Studio 2 Document |
| Stitch Era Design Document |
| dsi | DESI labeling system telephone label data |
| dsk | TOTAL Sketch Document |
| dsml | Directory Services Markup Language Document |
| dsn | Cadence OrCAD Design |
| Proteus Electronics Design |
