| dtg | Desktop Guitarist Music Score |
| dtp | Publish-It Document |
| dtx | Fiberworks Document |
| dtz | Circulus DigiGraph Document |
| dvg | Micrografx Graphics Works Document |
| dvi | Device Independent File |
| dw | DesignWorkshop Data |
| dw2 | DesignCAD for Windows 2D Drawing |
| dw4 | DisplayWrite 4 Document |
| dwa | Project Dogwaffle Animation |
| dwb | VariCAD 2D/3D Document |
| dwdoc | DrawWell Document |
| dwf | Autodesk Design Web Format |
| dwfdot | Altium Designer Draftsman Document Template |
| dwfx | Autodesk DWF XPS Document |
| dwg | Autodesk AutoCAD Drawing |
| dwsdot | Altium Designer Draftsman Sheet Template |
| dwt | Autodesk AutoCAD Template |
| dwt | Dreamweaver Web Template File |
| dwx | CADLock Locked AutoCAD Drawing |
| dx | DEC DX Document |
| dxa | hsbCAD Document |
| dxb | Autodesk Drawing Interchange Binary |
| dxb | Duxbury Braille Document |
| dxd | Diogenes Extended Document |
| dxe | Autodesk AutoCAD Data Extraction Template |
| dxf | Autodesk Drawing eXchange File |
| dxf | DEC DX Document |
| dxg | Duxbury Braille Translation Graphic File |
| dxl | IBM Rational DOORS eXtension Language Document |
| dxn | Fujitsu DexNet 200 Fax Document |
| dxp | Duxbury Print Document |
| dxpx | Design Expert Design |
| dyn | LS-DYNA Document |
| dyna | LS-DYNA Document |