CAD file formats are a mess.
I’m trying to get a part made in Autodesk Inventor into Mastercam.
IGES is borked. Half the surfaces don’t come in.
SAT has a version mismatch or something, and it refuses to import.
I don’t have a license for STEP import, apparently, and STL (even if it isn’t NURBS) is messed up like IGES.
This is obviously an attempt by Autodesk to dominate the world.