be aware that any changes you make to the models or model textures are unsupported here or by blizzard. Anything you break, you get to keep both pieces...
But just to clarify, it should be common sense to back up a file before you start reverse engineering it. That way if you screw up, you can just go back to the backup.
The changes being made here are not UI changes, and to be honest I don't think Blizz really cares for it, although doubtful they will enforce it as it only affects you, and no one else. Bear in mind they could institute signatures for the default files to prevent modification at any time. Either way though, be careful about your changes, and don't expect specific support if you break it.
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