Can't launch game using Mac Client

Hi, I just downloaded the OS X client from the website, but whenever I try and open the World of Warcraft file (not the Launcher) I get an error saying the file can't be opened. I've used other legacy servers' OS X clients before without issue, this is the first time I've encountered this. Any help would be great.

I'm using the Wrath client, if that's important. I just fired up an old vanilla client and that works flawlessly. Somehow it seems the Mac file for 3.3.5's client is unopenable

http://forum.warmane.com/showthread....wnloaded-files

Thanks so much! it worked perfectly