Well, it isn't, but I run it on my mac using VMWare Fusion
http://www.vmware.com/products/fusion/overview.html for $50.
This allows you to run a Windows virtual machine. The game and all Windows apps run as normal in the VM environment.
Down side is that you will also need to buy a Windows 7 license on top of the VM license, probably around another $200.
Expensive but it will get you there. The big upside is that once you are using VM, you can take backups of the Window environment and if the Mac ever crashes, you can reload without going through the hole reauth process.
PM me and I can walk you through it in detail if you are interested.
Rob