Basically you can't open a 'Windows' program on a Mac - unless you open/install it whilst in 'Boot Camp' which is on your Mac.
Like has already been said, there are lots of programs to download that will allow you to run Windows stuff.
Mark
p.s. I know of another CC who runs it on a Mac no problem (although havent spoke to him for a while). Maybe other Mac users can give their opinion to confirm?