Hey, what is the exact mime type for dwg files that WordPress uses?
I have gone through the following:
'application/acad', 'application/x-acad', 'application/autocad_dwg', 'image/x-dwg', 'application/dwg', 'application/x-dwg', 'application/x-autocad', '-mage/vnd.dwg', 'drawing/dwg',
and none of them takes the cake.