Autodesk DWG is a proprietary 3D geometry format native to Autodesk AutoCAD. Although it doesn't have modern material support, it is widely used in the BIM and CAD industries.
In addition to the general export options, the following option is available for DWG export:
|Flip vertical axis of textures|
Flips the textures along the vertical axis. This is necessary because Autodesk AutoCAD and Autodesk TrueView use different orientations.