How to fix faulty 3dm file?

 From:  Brian (BWTR)
1604.1 
I can not work out how to fix this file so that I can export it as say an .obj with all parts nicely welded together as one.
Export as a "single part" object.
(Is it a Brian day?)

Help appreciated.
Brian

EDITED: 31 Dec 2008 by BWTR