I don't think that either SAT or IGES has quite the same kind of unit setup where it can be a unit system flag then with a separate additional scale factor.

I don't know why you would want to store a file that is actually in inches with the "units are millimeters" flag and then with a scale factor that converts from mm to inches but that's apparently what ViaCAD or maybe ACIS decides to do. I mean it seems easier if you want the units to be inches to set the units value to inches and then it's done. But anyway the stock MoI v2 doesn't get this kind of extra scale factor situation figured out correctly but that's been fixed up since then.

- Michael