Export as *.sat (double check export units), *.igs or *.stp (if the translators
are present). Acad can create entity types (3D mesh reps, etc.) that are not
supported by one or more of those translators so you may still have some
problems to iron out.
I've been doing what you are trying to do with one exception ... I have
a seat of Mechanical Desktop. You can export as STEP, IGES etc. If
STEP does not work, then I try IGES, if IGES does not work, it's
desperation time. I recently converted an AutoCAD drawing to a VRML
file (it was fairly complex geometry), the ONLY thing that would work
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