i've been trying to download WoM hax for MC, and I can't seem to get it to work (I know not allowed in [BB] servers, but I want for single player and etc.)
Uninstall Java and reinstall the latest version. Also dl minecraft.jar from the website and put it in the lib folder. This will make it work (although for some reason on 0.30 it refuses to work for me after trying on 3 different PCs).
Well you could do what the people posted above or you could actually take the items out of the zipped folder meaning it will work properly.