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I'm not sure as I don't have your "rar" here, but besides .CAB files, some PPC programs come as .EXE files that are installed from your computer while connected to your phone with activesync,
This may be the case here, hook up phone and unrar the RAR on your computer to a file then open it and click on the .exe it should try to install to your phone if it's the case.
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