DWGs are not supported in the 2D environment, but can be converted into DXFs that are supported in both the 2D and 3D environments.
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Convert DWG to DXF
Using AutoCAD:
Open your DWG file in AutoCAD.
Go to the 'Application Menu' (big "A" in the top-left corner) and click on 'Save As'.
Choose 'Drawing Exchange Format (*.dxf)' from the 'Files of type' dropdown list.
Choose the location to save the DXF file and click 'Save'.
Using a Conversion Tool:
Go to an online conversion tool like Zamzar or Convertio.
Upload your DWG file.
Choose DXF as the output format.
Start the conversion and download the DXF file once it's complete.