Olympus E20 RAW Plugin

I have an E20N and have added the ORFRGB plugin to PS7.0.1 but still cannot open RAW files from the camera (they have the .orf extension, which I assume means Olympus Raw File). Perhaps I have the plugin in the wrong folder or am missing something obvious. Anyone have any clues to how I can resolve this?

TIA

It should be orf2rgb.8ba and it should be in your Photoshop\plug-ins directory.