Scott
The very first time I tried to open a 3D dwg or dxf (no solids, only wireframe) in SE the option to use a part template was available. I got an error message that SE did not have the correct filter to parse the file and dumped me out of the part environment.
Subsequent attempts did not present me with the option to choose an environment. It just opened the draft environment and presented a 2D view(as parsed by the SEACAD.INI script/file).
Willem