The original pre launch version of SolidWorks was based on ACIS, then they pretty quickly switched to Parasolid due to issues with how ACIS handled certain geomtry back then, parasolid was just better atleast at the time. so I believe it is just that legacy registry entries you are seeing it’s been ...

Ok, the question got me curious, and the cagey response got me even more curious. If you're interested in this topic, you can find a bit of an answer here: https://www.onshape.com/en/blog/data-management-comparing-cad-files-and-databases Interestingly, part of that response is also of the "you...