Well the other thing the cab does is set a registry value on your device:
[HKEY_LOCAL_MACHINE\MUI]
"Enable"=dword:00000001
That value was already set on my PPC6700. But it may not be set on all devices (I don't know for sure). So either add that entry or install the cab file (followed by a soft reset) to see if that makes it work for you.
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