| .D2D | Unknown Developer | CAD-bestanden | 3D Fassade Plus CAD Data | 3D Fassade Plus | Unknown Developer |
| .DAB | Epigon Media Technologies | CAD-bestanden | Digital Audio Broadcasting Audio Data | DMB Player | Epigon Media Technologies |
| .DB1 | Trimble Inc. | CAD-bestanden | Tekla Structures Model File | Tekla Structures BIM software | Trimble Inc. |
| .DB_ | Unknown Developer | CAD-bestanden | CAD File | Unknown Software | Unknown Developer |
| .DC | IMSI/Design, LLC | CAD-bestanden | DesignCAD Design File | IMSI DesignCAD 3D Max | IMSI/Design, LLC |
| .DC1 | DevCad | CAD-bestanden | DevCad Document | DevCad Cam Pro | DevCad |
| .DC2 | Kodak | CAD-bestanden | Kodak Digital Camera RAW Image File | Adobe Photoshop | Adobe Systems Incorporated |
| .DC3 | IMSI/Design, LLC | CAD-bestanden | DesignCAD 3D ASCII Drawing | IMSI DesignCAD 3D Max | IMSI/Design, LLC |
| .DC5 | BIGAL | CAD-bestanden | DynaCAD CAD Document | DynaCAD | BIGAL |
| .DCD | IMSI/Design, LLC | CAD-bestanden | DesignCAD Drawing | IMSI DesignCAD 3D Max | IMSI/Design, LLC |
| .DCH | Novarm | CAD-bestanden | DipTrace Schematics File | DipTrace | Novarm |
| .DCZ | BIGAL | CAD-bestanden | DynaCAD CAD Document | DynaCAD | BIGAL |
| .DDP | Embarcadero Technologies | CAD-bestanden | Delphi Diagram Portfolio File | Delphi (IDE) | Embarcadero Technologies |
| .DFT | Breaktru Software | CAD-bestanden | eJuice Me Up Default Settings File | eJuice Me Up | Breaktru Software |
| .DFX | Autodesk, Inc. | CAD-bestanden | Drafix CAD File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DGB | Digitarch | CAD-bestanden | FlashCAD Drawing Database | Digitarch FlashCAD | Digitarch |
| .DGK | Autodesk, Inc. | CAD-bestanden | Delcam 3D Model File | ArtCAM | Autodesk, Inc. |
| .DGN | Bentley Systems | CAD-bestanden | MicroStation Drawing File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .DGR | Bentley Systems | CAD-bestanden | DART Pro 98 File Group Details | MicroStation | Bentley Systems |
| .DLV | Dassault Systèmes | CAD-bestanden | CATIA 4 Export File | CATIA | Dassault Systèmes |
| .DLX | DIAL | CAD-bestanden | DIALux Document | DIAL DIALux | DIAL |
| .DMZ | Dofl Y.H. Yun | CAD-bestanden | DMesh 3D Model File | DMesh | Dofl Y.H. Yun |
| .DRA | Nuance | CAD-bestanden | Dragon NaturallySpeaking Voice | Dragon NaturallySpeaking | Nuance |
| .DRU | Autodesk, Inc. | CAD-bestanden | EAGLE Design Rules File | Autodesk EAGLE | Autodesk, Inc. |
| .DRW | Corel | CAD-bestanden | DESIGNER Drawing | Corel Presentations X8 | Corel |
| .DSG | Simon Howard (Fraggle) | CAD-bestanden | Doom Saved Game | Chocolate Doom | Simon Howard (Fraggle) |
| .DSN | Cadence Design Systems | CAD-bestanden | OrCAD Design File | OrCAD PCB Designer | Cadence Design Systems |
| .DST | Autodesk, Inc. | CAD-bestanden | AutoCAD Sheet Set File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DTN | IQSoft | CAD-bestanden | TunnelCAD Import Or Export File | Tunnel CAD | IQSoft |
| .DVG | GraphicWorks | CAD-bestanden | Graphic Works Vector Graphic | Data Becker | GraphicWorks |
| .DW2 | IMSI/Design, LLC | CAD-bestanden | DesignCAD Drawing | IMSI DesignCAD 3D Max | IMSI/Design, LLC |
| .DWB | Coryphaeus Software | CAD-bestanden | Designer's Workbench File Format | Designer's Workbench | Coryphaeus Software |
| .DWFX | Autodesk, Inc. | CAD-bestanden | Design Web Format XPS File | Navisworks | Autodesk, Inc. |
| .DWG | Autodesk, Inc. | CAD-bestanden | AutoCAD Drawing Database File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DWM | Open Source | CAD-bestanden | Digital Works Circuit Project | Digital Works | Open Source |
| .DWS | Autodesk, Inc. | CAD-bestanden | AutoCAD Drawing Standards File | Autodesk AutoCAD | Autodesk, Inc. |
| .DWT | Adobe Systems Incorporated | CAD-bestanden | Dreamweaver Web Page Template | MacroMates TextMate | MacroMates |
| .DXE | Autodesk, Inc. | CAD-bestanden | AutoCAD Data Extraction Template | Autodesk AutoCAD | Autodesk, Inc. |
| .DXF | Autodesk, Inc. | CAD-bestanden | Drawing Exchange Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DXX | Autodesk, Inc. | CAD-bestanden | AutoCAD Drawing Interchange Attribute File | Autodesk AutoCAD | Autodesk, Inc. |
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