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Slightly offtop... May be it should be interesting to try Rhino3D? As for me - the best soft for Mscribe. Not free but unexpensive and exellent funcionality.

What kind of machining you would like to use?

Exactly Gcode or PM traectory?

Hi collegue, I also use just start to use PowerMill for stoneworking, I use Emmedue Discovery and GMM Blizz (now on mounting).
If G-code of you machine isn't very cmplicated i could cend you my post.

Its impossible, you need to create a new one...