I'm not sure what that game is. Why did you back your own game up to a rar? that's weird.
extract it. hook your USB device to your PC. Start WBFS Manager 3.0. Format the USB device. Click browse. Find the iso you exracted. Click add. Wait. Unplug your USB device. Plug it into your wii. Start your USB launcher. click 'a' a few times. Suck at tennis. La fin.