Originally Posted by Xrystal
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A note to add, the general release version works fine on the core MPQs, the patch MPQs require the beta version and to be opened in patched mode over the core MPQs... the patch files don't necessarily contain the entire patched file, rather the changes in that file since the previous patch. This is what patched mode was made for. Also note the new MPQ files cannot be accessed while the game client is running, there is a built-in locking mechanism with the MPQ archives. There is a bug with MPQEditor in which it doesn't consider the "/base/" directory for patching files.
This analysis was over the Cataclysm Beta client, the 4.0.1 live client may differ.