| .3DA | Unknown Developer | 3D Image Files | 3D Assembly File | ArtCAM | Autodesk, Inc. |
| .3DM | Redway3d and others | 3D Image Files | Rhino 3D Model | Autodesk Fusion 360 | Autodesk, Inc. |
| .3DP | Futuremark Corporation | Data Files | 3DMark2011 SE Project File | Autodesk 123D Catch | Autodesk, Inc. |
| .AAS | Adobe Systems Incorporated | Data Files | Adobe Authorware Shocked Packet File | Autodesk Animator | Autodesk, Inc. |
| .ACB | Adobe Systems Incorporated | Settings Files | Adobe Photoshop Color Book File | Autodesk AutoCAD | Autodesk, Inc. |
| .ADI | Active@ Data Recovery Software | Backup Files | Active@ Disk Image Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .ADT | Swiftpage, Inc. | Data Files | ACT! Document Template | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .AEF | Autodesk, Inc. | CAD Files | ELECTRICAL Designe | Autocad Electrical | Autodesk, Inc. |
| .AHP | Autodesk, Inc. | Data Files | AutoCAD Help Data | Autodesk AutoCAD | Autodesk, Inc. |
| .AMF | Autodesk, Inc. | 3D Image Files | Additive Manufacturing File | Autodesk Meshmixer | Autodesk, Inc. |
| .ANIM | Autodesk, Inc. | 3D Image Files | Maya Animation File | Autodesk Maya | Autodesk, Inc. |
| .APJ | The FreeBSD Community | Data Files | FreeBSD File | Autodesk AutoCAD | Autodesk, Inc. |
| .ARG | Autodesk, Inc. | Settings Files | AutoCAD Profile | Autodesk AutoCAD | Autodesk, Inc. |
| .ART | Autodesk, Inc. | CAD Files | ArtCAM Model | ArtCAM | Autodesk, Inc. |
| .ARX | Autodesk, Inc. | Plugin Files | AutoCAD Runtime Extension File | Autodesk AutoCAD | Autodesk, Inc. |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File | Autodesk 3ds Max | Autodesk, Inc. |
| .ASM | Open Source | Developer Files | Assembly Language Source Code File | Autodesk Fusion 360 | Autodesk, Inc. |
| .ATC | Autodesk, Inc. | Settings Files | AutoCAD Tool Catalog File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .AWS | Autodesk, Inc. | System Files | AutoCAD Work Space File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .AXD | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Autodesk AutoCAD | Autodesk, Inc. |
| .BIO | IBM | System Files | BIOS File | Autodesk Mudbox 2017 | Autodesk, Inc. |
| .BIP | Unknown Developer | 3D Image Files | Character Studio Biped File | Character Studio | Autodesk, Inc. |
| .BK1 | Autodesk, Inc. | Backup Files | Autodesk Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .BLK | Autodesk, Inc. | CAD Files | AutoCAD Block Template File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .BMI | Autodesk, Inc. | Plugin Files | 3D Studio Max Plugin | Autodesk 3ds Max | Autodesk, Inc. |
| .BPL | Autodesk, Inc. | Uncommon Files | AutoCAD Batch Plot File | Autodesk AutoCAD | Autodesk, Inc. |
| .BRD | Autodesk, Inc. | Data Files | EAGLE Circuit Board File | CadSoft EAGLE | Autodesk, Inc. |
| .CAL | Newera Software Technology, Inc. | Raster Image Files | CALS Raster File | Autodesk 3ds Max | Autodesk, Inc. |
| .CAM | Ucamco | CAD Files | Gerber CAM Job File | CadSoft EAGLE | Autodesk, Inc. |
| .CAS | Autodesk, Inc. | Data Files | Autodesk Cascade License File | AutoCAD Architecture | Autodesk, Inc. |
| .CATPART | Dassault Systèmes | CAD Files | CATIA V5 Part File | Autodesk Fusion 360 | Autodesk, Inc. |
| .CATPRODUCT | Dassault Systèmes | CAD Files | CATIA V5 Assembly File | Autodesk Fusion 360 | Autodesk, Inc. |
| .CDC | Autodesk, Inc. | Raster Image Files | AutoCAD DesignCenter Preview Cache File | Autodesk AutoCAD | Autodesk, Inc. |
| .CHR | Crytek | 3D Image Files | CryENGINE Character File | Autodesk 3ds Max | Autodesk, Inc. |
| .CHX | Autodesk, Inc. | Settings Files | AutoCAD Standards Check File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .CJB | Autodesk, Inc. | Compressed Files | Autodesk Cleaner XL Job | Autodesk Cleaner XL | Autodesk, Inc. |
| .CLT | Clarity Legal | Page Layout Files | Clarity Legal Transcript File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .COF | Microchip Technology Inc. | Executable Files | MPLAB COFF File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .COL | Open Source | Data Files | Bibexcel File | Autodesk Animator | Autodesk, Inc. |
| .CPY | Autodesk, Inc. | 3D Image Files | 3ds Max Copy Track File | Autodesk 3ds Max | Autodesk, Inc. |
| .CSM | Autodesk, Inc. | 3D Image Files | Character Studio Marker File | Character Studio | Autodesk, Inc. |
| .CTB | Autodesk, Inc. | Settings Files | AutoCAD Color-Based Plot Style File | Autodesk AutoCAD | Autodesk, Inc. |
| .CUS | Autodesk, Inc. | Settings Files | AutoCAD Custom Dictionary File | Autodesk AutoCAD | Autodesk, Inc. |
| .DAB | Epigon Media Technologies | Audio Files | Digital Audio Broadcasting Audio Data | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DAE | Sony | 3D Image Files | Digital Asset Exchange File | Autodesk Maya | Autodesk, Inc. |
| .DB3 | Dwayne Richard Hipp | Database Files | SQLite Database File | AutoCAD Map 3D | Autodesk, Inc. |
| .DBX | Microsoft Corporation | Uncommon Files | Outlook Express E-mail Folder | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DCL | Autodesk, Inc. | Settings Files | AutoCAD Dialog Definition File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DCN | Autodesk, Inc. | Settings Files | Autodesk Depth Slope Definition | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DCT | Microsoft Corporation | Data Files | Dictionary File | Autodesk AutoCAD | Autodesk, Inc. |
| .DEI | Open Source | Data Files | Gerber Design Engineered Interface | Autodesk EAGLE | Autodesk, Inc. |
| .DFM | Open Source | Text Files | Pascal File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DFS | Open Source | 3D Image Files | BrainSuite Surface File | Autodesk AutoCAD | Autodesk, Inc. |
| .DFX | Autodesk, Inc. | CAD Files | Drafix CAD File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DGK | Autodesk, Inc. | CAD Files | Delcam 3D Model File | ArtCAM | Autodesk, Inc. |
| .DLC | JDownloader Team | Encoded Files | Download Link Container File | Autodesk 3ds Max | Autodesk, Inc. |
| .DLM | AKAMAI | Uncommon Files | Akamai Download Manager File | Autodesk 3ds Max | Autodesk, Inc. |
| .DLO | Autodesk, Inc. | Plugin Files | 3ds Max Plug-in | Autodesk 3ds Max | Autodesk, Inc. |
| .DLU | Autodesk, Inc. | Plugin Files | 3ds Max Utility Plug-in File | Autodesk 3ds Max | Autodesk, Inc. |
| .DRU | Autodesk, Inc. | CAD Files | EAGLE Design Rules File | Autodesk EAGLE | Autodesk, Inc. |
| .DRW | Corel | Vector Image Files | DESIGNER Drawing | AutoCAD for Mac | Autodesk, Inc. |
| .DSD | Autodesk, Inc. | Settings Files | AutoCAD Drawing Set Description File | Autodesk AutoCAD | Autodesk, Inc. |
| .DST | Autodesk, Inc. | CAD Files | AutoCAD Sheet Set File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DVB | Autodesk, Inc. | Developer Files | AutoCAD VBA Project File | AutoCAD VBA module | Autodesk, Inc. |
| .DVP | Autodesk, Inc. | Settings Files | AutoCAD Device Parameter File Format | Autodesk AutoCAD | Autodesk, Inc. |
| .DWF | Autodesk, Inc. | 3D Image Files | Autodesk Design Web Format File | AutoCAD 360 | Autodesk, Inc. |
| .DWFX | Autodesk, Inc. | CAD Files | Design Web Format XPS File | Navisworks | Autodesk, Inc. |
| .DWG | Autodesk, Inc. | CAD Files | AutoCAD Drawing Database File | Autodesk Fusion 360 | Autodesk, Inc. |
| .DWS | Autodesk, Inc. | CAD Files | AutoCAD Drawing Standards File | Autodesk AutoCAD | Autodesk, Inc. |
| .DWZ | Corel | Data Files | DVD MovieFactory Project File | Autodesk AutoCAD | Autodesk, Inc. |
| .DXB | Autodesk, Inc. | Vector Image Files | Drawing Exchange Binary | Autodesk AutoCAD | Autodesk, Inc. |
| .DXE | Autodesk, Inc. | CAD Files | AutoCAD Data Extraction Template | Autodesk AutoCAD | Autodesk, Inc. |
| .DXF | Autodesk, Inc. | CAD Files | Drawing Exchange Format | DWG TrueView | Autodesk, Inc. |
| .DXX | Autodesk, Inc. | CAD Files | AutoCAD Drawing Interchange Attribute File | Autodesk AutoCAD | Autodesk, Inc. |
| .EASM | Dassault Systèmes | CAD Files | eDrawings Assembly File | Autodesk Inventor | Autodesk, Inc. |
| .EIL | Cadsoft | 3D Image Files | Eagle Library Intermediate Data | CadSoft EAGLE | Autodesk, Inc. |
| .EPF | Vero Software | Data Files | Edgecam Educational Part File | CadSoft EAGLE | Autodesk, Inc. |
| .ERR | Microsoft Corporation | Text Files | Error Log File | Autodesk AutoCAD | Autodesk, Inc. |
| .ESJ | Thermwood Corporation | CAD Files | eCabinet CAD File | Autodesk Fabrication CAMduct | Autodesk, Inc. |
| .EZC | Autodesk, Inc. | CAD Files | AutoCAD Ecscad Components Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .EZP | Autodesk, Inc. | CAD Files | AutoCAD Ecscad Project Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .F3D | Autodesk, Inc. | 3D Image Files | Fusion 3D Design | Autodesk Fusion 360 | Autodesk, Inc. |
| .F3Z | Autodesk, Inc. | 3D Image Files | Fusion 360 Distributed Design File | Autodesk Fusion 360 | Autodesk, Inc. |
| .FAS | Autodesk, Inc. | Executable Files | Compiled Fast-Load AutoLISP File | Autodesk AutoCAD | Autodesk, Inc. |
| .FBK | Microsoft Corporation | Backup Files | Microsoft Dynamics NAV Backup File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .FDC | Autodesk, Inc. | Settings Files | AutoCAD Field Catalog File | Autodesk AutoCAD | Autodesk, Inc. |
| .FGM | Autodesk, Inc. | Settings Files | 3ds Max Final Gather Map File | Autodesk 3ds Max | Autodesk, Inc. |
| .FIG | Open Source | Vector Image Files | Xfig Drawing | Autodesk 3ds Max | Autodesk, Inc. |
| .FIS | 3AM Solutions | Graphic Files | Dynamite VSP Feature Interpretation Style | Viz | Autodesk, Inc. |
| .FMP | Dreamingsoft | Web Files | 123 Flash Menu Project | Autodesk AutoCAD | Autodesk, Inc. |
| .GBL | Ucamco | Data Files | Gerber Bottom Layer Data File | CadSoft EAGLE | Autodesk, Inc. |
| .GBP | Genie | Backup Files | Genie Timeline Backup Index File | Autodesk EAGLE | Autodesk, Inc. |
| .GFX | Autodesk, Inc. | Game Files | GFx Scaleform File | Scaleform GFx | Autodesk, Inc. |
| .GML | Galdos Systems, Inc. | GIS Files | Geography Markup Language File | Autodesk EAGLE | Autodesk, Inc. |
| .GPI | Garmin | Data Files | Garmin Point Of Interest File | Autodesk EAGLE | Autodesk, Inc. |
| .GTO | Quicken | Data Files | Quicken Online Data File | Autodesk EAGLE | Autodesk, Inc. |
| .GTP | Ucamco | Data Files | Gerber Top Solder Paste Data File | CadSoft EAGLE | Autodesk, Inc. |
| .GTS | Ucamco | Data Files | Gerber Top Solder Mask Data File | Autodesk EAGLE | Autodesk, Inc. |
| .HDC | TCD Labs | Data Files | HD Tach Benchmark Results | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .HDI | Open Source | Disk Image Files | Hard Disk Image | Autodesk AutoCAD | Autodesk, Inc. |