How to convert an STL file to Parasolid (solid geometry)

Edit 2020-July-13: Mentat is no longer required to convert the STL into a mesh. The STL can now directly be imported into MSC Apex.
In this video you will see the few simple steps required to create complex but solid geometry (Parasolid format) from an STL (or mesh) file using Mentat and MSC Apex.