I often go on Brands of the World so as to get good-quality logos instead of those tiny jpgs/pngs clients usually supply but i've often encountered the same problem for logos in .cdr format: they're Corel Draw files, but there's no way i can open them in Illustrator on a Mac.
I've consistently had this problem from on OsX 10.4 thru 10.8...
Anybody have an idea?