dxfdwg.aip refers to a critical internal plugin for Adobe Illustrator that enables the software to import and export AutoCAD

6.3 Convert DXF/DWG Without the Problematic Software

If the software that requested dxfdwg.aip was a converter or viewer, use free alternatives:

: Standard reinstallation often fails to fix the error. Successful users recommend using the Adobe Creative Cloud Cleaner Tool