Do not have one at work, but see here for .3dm file:

http://www.rhino3d.nl/pythposter/pyth3dm-eng.html

- Brian

You can always construct one in MoI. http://moi3d.com/forum/index.php?webtag=MOI&msg=2140.46

Before I knew of MoI: MoI Forum 2008 ref link:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2140.55
There is a zip file of gif and names further down.