Hi Robert, it's not coming in because the object in the .3dm file is a triangle mesh type object and not a NURBS type of object.

MoI is not set up to work with polygon mesh data for modeling so it will just skip over those kinds of objects.

If you can convert it into an .obj file you could use the OBJ to Wireframe converter from here (http://moi3d.com/resources#Obj23dmWireframe_converter) to convert the polygon data into lines in a .3dm file which can then be opened in MoI to see a wireframe of the mesh object

But basically that type of object data where it's made up of a whole bunch of little triangles and not structured surfaces is not suitable for working on with MoI.

- Michael