If you had a Rio Receiver and kernel hacking skills you could possibly actually run the Rio Receiver player software on an empeg/Rio Car.

In the kernel hacking you could map the calls that the Receiver player software makes through to the empeg hardware (which in many cases is very similar anyway).

It would obviously be much easier to just buy another Receiver, unless you lived outside the US of course...
_________________________
Remind me to change my signature to something more interesting someday