Downloads problems for a Mac

[Mikidoo]

I downloaded Korg Legacy analog that says it's for a Mac OS X vst,au. When the download appears on my desktop the icon looks like a zip file but it says .rar. I open it and its for a .dll file and .exe ;every thing in the folder is for Windows. This has happened to me on four occassions. Is there anything on this site for a Mac? Or, am I missing something? Please Help!