Hi Michael,
thank you for your quickly answer.
I think the step-file (24MB) is'nt too big to convert in obj for example.
So I selected one piece and tried to export ("select (the piece change to yellow)" - "file" - "export" - "obj"). It's the same thing: Insufficient memory :-(
I put the slider to "Fewer polygones" (Output: N-gones, Display: Shaded + edges, Angle: 35) but at 33% the message comes.
ViaCad is a 32-bit program too and it convert this step-File, unfortunately with some wrong meshes.

Peter

System Mac OS X 10.6.8, 24 GB RAM, 2 x 2,66 GHz 6-Core

By the way: MoI is great :-)