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