Right, I've tried all of these things. I've wiped them and re-downloaded them more than eight times. I've tried extracting them without doing it batch-style. I've done the drag-n-drop. It all leads to the same error.
If you try to extract with drag and drop, it gives you "Archive Header Broken" for part01.
If you try to do anything to the other parts, you get "List index out of bounds (0)" and no files show up in the archive.