Somebody correct me if I am wrong but I thought Warcraft 2 was an MS-DOS game. Was there a Windows version as well?
I am running Warcraft 2 in Boxer myself and it works very well. The version I have includes the expansion as well but I am not sure if that means it is the Battlenet Edition or not.
Anyway, you sure can run it on OS X with Boxer if you get the MS-DOS version. It works great.
By the way, I don't know what year a Mac version would have released without going to look it up (sorry, too lazy) but the DOS version was 1996 so I presume a Mac release would have predated any version of OS X and been for a version of MacOS.