| .DAB | Epigon Media Technologies | Äänitiedostot | Digital Audio Broadcasting Audio Data | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DAE | Sony | 3D-kuvatiedostot | Digital Asset Exchange File | Autodesk Maya | Autodesk, Inc. |
| .DB3 | Dwayne Richard Hipp | Tietokantatiedostot | SQLite Database File | AutoCAD Map 3D | Autodesk, Inc. |
| .DBX | Microsoft Corporation | Harvinaiset Tiedostot | Outlook Express E-mail Folder | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DCL | Autodesk, Inc. | Asetustiedostot | AutoCAD Dialog Definition File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DCN | Autodesk, Inc. | Asetustiedostot | Autodesk Depth Slope Definition | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DCT | Microsoft Corporation | Datatiedostot | Dictionary File | Autodesk AutoCAD | Autodesk, Inc. |
| .DEI | Open Source | Datatiedostot | Gerber Design Engineered Interface | Autodesk EAGLE | Autodesk, Inc. |
| .DFM | Open Source | Tekstitiedostot | Pascal File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DFS | Open Source | 3D-kuvatiedostot | BrainSuite Surface File | Autodesk AutoCAD | Autodesk, Inc. |
| .DFX | Autodesk, Inc. | CAD-tiedostot | Drafix CAD File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DGK | Autodesk, Inc. | CAD-tiedostot | Delcam 3D Model File | ArtCAM | Autodesk, Inc. |
| .DLC | JDownloader Team | Koodatut tiedostot | Download Link Container File | Autodesk 3ds Max | Autodesk, Inc. |
| .DLM | AKAMAI | Harvinaiset Tiedostot | Akamai Download Manager File | Autodesk 3ds Max | Autodesk, Inc. |
| .DLO | Autodesk, Inc. | Laajennustiedostot | 3ds Max Plug-in | Autodesk 3ds Max | Autodesk, Inc. |
| .DLU | Autodesk, Inc. | Laajennustiedostot | 3ds Max Utility Plug-in File | Autodesk 3ds Max | Autodesk, Inc. |
| .DRU | Autodesk, Inc. | CAD-tiedostot | EAGLE Design Rules File | Autodesk EAGLE | Autodesk, Inc. |
| .DRW | Corel | Vektorikuvatiedostot | DESIGNER Drawing | AutoCAD for Mac | Autodesk, Inc. |
| .DSD | Autodesk, Inc. | Asetustiedostot | AutoCAD Drawing Set Description File | Autodesk AutoCAD | Autodesk, Inc. |
| .DST | Autodesk, Inc. | CAD-tiedostot | AutoCAD Sheet Set File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DVB | Autodesk, Inc. | Sovelluskehittäjän tiedostot | AutoCAD VBA Project File | AutoCAD VBA module | Autodesk, Inc. |
| .DVP | Autodesk, Inc. | Asetustiedostot | AutoCAD Device Parameter File Format | Autodesk AutoCAD | Autodesk, Inc. |
| .DWF | Autodesk, Inc. | 3D-kuvatiedostot | Autodesk Design Web Format File | AutoCAD 360 | Autodesk, Inc. |
| .DWFX | Autodesk, Inc. | CAD-tiedostot | Design Web Format XPS File | Navisworks | Autodesk, Inc. |
| .DWG | Autodesk, Inc. | CAD-tiedostot | AutoCAD Drawing Database File | Autodesk Fusion 360 | Autodesk, Inc. |
| .DWS | Autodesk, Inc. | CAD-tiedostot | AutoCAD Drawing Standards File | Autodesk AutoCAD | Autodesk, Inc. |
| .DWZ | Corel | Datatiedostot | DVD MovieFactory Project File | Autodesk AutoCAD | Autodesk, Inc. |
| .DXB | Autodesk, Inc. | Vektorikuvatiedostot | Drawing Exchange Binary | Autodesk AutoCAD | Autodesk, Inc. |
| .DXE | Autodesk, Inc. | CAD-tiedostot | AutoCAD Data Extraction Template | Autodesk AutoCAD | Autodesk, Inc. |
| .DXF | Autodesk, Inc. | CAD-tiedostot | Drawing Exchange Format | DWG TrueView | Autodesk, Inc. |
| .DXX | Autodesk, Inc. | CAD-tiedostot | AutoCAD Drawing Interchange Attribute File | Autodesk AutoCAD | Autodesk, Inc. |
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