I'm having a slight problem. Only the .mdx files are working for me, but the .m2 files' models just don't show in-game - this is probably due to the fact that I don't have the patch in the data folder. The reason for THAT, however, is that if I do put it in the data folder, I get a "File is corrupted" error message upon trying to enter WoW.
Any ideas? If I need to explain something better, just tell me.