Yes, Michael you are right,
it is known, Moi and polygon does not go.
But both tools bring lines from polygons (created in Wings3d) in to Moi.
Both tools offer a different alternative.
Obj23dmWireframe = separate line segments, filesize larger

EDIT:

HE
***ObjTo3dm = closed line segments, filesize smaller, no luck import geometry with polys less than 5 sides
***

Best alternative for geodome could be Grasshopper, in continuous honeycomb geometry.
http://api.ning.com/files/tNXd3jNkkDzdZmhUQDh7YDdlF2KdESpiSaTFPw8Pu06N5PtTrbnbBpxirrXxEQlj/CUPULOO8.JPG