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What free app(s) work best for opening .dwg files?
It is not a Windows file.
You will have to make the choice of what you want to use.
Use 3rd party programs at your own risk
https://fileinfo.com/extension/dwg
A DWG file is a database of 2D or 3D drawings created with AutoCAD, a professional CAD program. It contains vector image data and metadata that describes the contents of the file. DWG files are related to .DXF files, which are ASCII versions of DWG files.
DWG files can be viewed on Windows using Autodesk's free DWG TrueView program. They may also be opened by other third-party applications that support the DWG format.
Programs that open DWG files
| Windows | Autodesk AutoCAD 2018 | <br> | --- | <br> | Autodesk Design Review | <br> | Autodesk DWG TrueView | <br> | AutoDWG DWGSee | <br> | CADSoftTools ABViewer | <br> | IMSI TurboCAD Pro | <br> | IMSI DoubleCAD | <br> | ACD Systems Canvas X 2019 | <br> | CorelCAD 2018 | <br> | GRAPHISOFT ArchiCAD | <br> | Dassault Systemes SolidWorks eDrawings Viewer | <br> | AnyDWG Any DWG to PDF Converter | <br> | Adobe Illustrator CC 2019 | <br> | Serif DrawPlus | <br> | Bricsys Bricscad | <br> | Dassault Systemes DraftSight | <br> | Wout Ware DWG DXF Sharp Viewer |
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Cheers.