AutoCAD Inventor :: Export Of Ellipses

I often use Inventor to generate 2D views of things for AutoCAD.  Once I get the view into AutoCAD, I want to copy the outline, make a polyline of it, decurve it and make a wipe out of that.  

This is all well and good until Inventor exports an ellipse in the drawing.  They can't be converted to a polyline.  So, is there some way to force Inventor to export them as some other entity type or is there a way to convert them in AutoCAD that I'm not aware of?  The only two things I've tried are flatten and explode and neither of them works.