Do you mean the MIDI .rmi files? If you do, than I can suggest you visiting modplug.com, download the ModPlug Tracker, what can open MIDI files and save 'em as .MOD files.
If it doesn't support .rmi, you can easily find an rmi2midi converter on the net - I'm not sure, but i think WinAMP can handle this as well (stick around the midi plug-in for more info)