I wouldn't know, I don't make coding errors.
I'm just joking, yes, I've seen that too. His latest homescreens install via CAB so there shouldn't be any problems. Unless....
extravagant, are you unpacking the CAB file on your desktop and then copying the files across to your device? Windows will see the CAB file as a sort of zip folder and allow it to be uncompressed. DON'T DO IT. Leave it as a CAB and copy the whole file to your phone. Then once it's on the phone, use the file manager (from the phone) and run it. It should prompt you for installing and let it go.
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"I have no special talents, I am only passionately curious" - Albert Einstein