Ironcad can import most Pro-E parts but if any of the files were created using surfaces or contain surface features... forget it !

Anything with a Pro-E surface gets reduced to a very simple geometry.. maybe only 10% of what was originally there.

Assemblies, or atleast small assemblies will import but again, if any of the parts have a Pro-E surface, it won't work.

Better export files with surfaces as neutral files, step files iges or .g !