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