Maybe you could check their EntityClass to see if they are pivots? If they are, you could check if they are set as a parent to any of the non-empty meshes ? Then you could also try the .X format or find a .B3D exported (which would be better, however I'm not sure if there is any: http://www.google.com/search?hl=en&q=blender+b3d)
Blender Models
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