Hello Schbeurd,

I'm not Michael but was intrigued by your question.
When I open your file in Illustrator, the path has no thickness.
When thickness is added (any thickness will do) and the file saved (I used CS3 for the test), it imports correctly into MoI.

- Michel

Edit - But... when I try to create a plane or extrude the star shape, here is what I get :