Pixel 3D
This doesn't invalidate what I said… EPS files can include previews, and
within the subset of PostScript known as EPS, there's a standard EPS format
called "Adobe Illustrator" files. These are even easier to interpret than EPS
or PostScript. Perhaps they tried to process Pro Draw files the same way, by
handling the subset of PostScript used by a particular program. It's entirely
possible they've integrated any one of the publically available PostScript
interpreters. Converting generalized PostScript to 3D is an entirely different
problem than printing to a screen, in either case.