I'd either try a prog called "Super" to convert, or if all else fails then play the ra file through any audio player and use a prog called "Audacity" to record it as it plays.
A bit like putting a tape into your hifi and recording what's on the radio : if anything else comes through your speakers, that'll be recorded as well.
On the plan A of converting : have a look here and see if that'll do it...
http://media-convert.com/convert/
or if they
http://www.videohelp.com/
have any other ideas.