| .ATC | Autodesk, Inc. | Indstillingsfiler | AutoCAD Tool Catalog File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .CLT | Clarity Legal | Sideopsætningsfiler | Clarity Legal Transcript File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .COF | Microchip Technology Inc. | Eksekverbare filer | MPLAB COFF File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DAB | Epigon Media Technologies | Lydfiler | Digital Audio Broadcasting Audio Data | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DCN | Autodesk, Inc. | Indstillingsfiler | Autodesk Depth Slope Definition | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DFM | Open Source | Tekstfiler | Pascal File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .FBK | Microsoft Corporation | Sikkerhedskopifiler | Microsoft Dynamics NAV Backup File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .HDC | TCD Labs | Datafiler | HD Tach Benchmark Results | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .HTP | Autodesk, Inc. | CAD-filer | Autodesk Slope Template Definition | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .ICN | Microsoft Corporation | Rasterbilledfiler | Windows Icon File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .INP | Concept Software | Sideopsætningsfiler | Urdu InPage Document | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .LK# | Autodesk, Inc. | CAD-filer | Autodesk Multi-User Coordination Lock Data | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .PDA | Molecular Devices | Datafiler | SoftMax Pro Microplate Data Analysis File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .PFB | Adobe Systems Incorporated | Skrifttypefiler | Printer Font Binary File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .PSP | Corel Corporation | Rasterbilledfiler | PaintShop Pro Image | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .RAT | World Wide Web Consortium (W3C) | Ikke Almindelige Filer | PICS Rating File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .RTC | Brain Innovation | Datafiler | BrainVoyager QX Design Matrix File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .SDC | Stardock Corporation | Sikkerhedskopifiler | Stardock Central Download Archive | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .SDF | Microsoft Corporation | Databasefiler | SQL Server Compact Database File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .SHX | Autodesk, Inc. | CAD-filer | AutoCAD Compiled Shape File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .SLP | Magix Software GmbH | Lydfiler | SpectraLayers Pro Project | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .SSC | Microsoft Corporation | Udviklerfiler | SourceSafe Status File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .TBL | Blizzard Entertainment Inc. | Datafiler | StarCraft Information Table | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .TDF | DVD Copy | Indstillingsfiler | Title Definition Format File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .XSP | Open Source | Lydfiler | Kodi Smart Playlist File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .XTP | adnx | Datafiler | xTime Project Document | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
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