I use SolidWorks, Inventor, Rhino at work. And i use MOI to repair IGES and STEP from various systems. If your CAD file is a valid volume in Inventor or SolidWorks, you could try Acis Sat. If i am correct, that is Moi3d's mathematical kernel and should work better. But sometimes i can load IGES and STEP files in Moi3d that would kill Inventor or Soldidworks. As far as i can tell, there is no easy way to say, this type works 100% all of the time.
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