AC1032 is compatible with/made by AutoCad version 2018. It may be that Catia has not caught up to that release. DWG was intended to be proprietary to prevent other companies from using it. DXF (drawing exchange format) is the one for drawing interchange, but there are those who reverse engineer/license the DWG format.
If you can save a drawing as DWG, what release is it said to be compatible with?