ah yes that pesky "corrupt" or unopenable file situation. recently tried out an intellicad 2009 version that would not open a fie that is otherwise working fine in my 2008 release. Go figure
yeah just mentioned double cad since it has saved me spending cash on some sort of file export for cad, you gotta love the recent developments in low cost CAD alternatives. And when they come out free for ANY USE as opposed to say free for non-commercial (and what is non commercial exactly?) then I am getting really really excited about the future of electronic drawing and art
BIG SHOUT TO GOOGLE for making a free sketchup too!