Pierre, if you can give me that RealAudio sound you uploaded in some other format (any other--wav, aiff, au, or even raw bytes), I'll recode it into an Ogg so that we'll both be able to hear it.
I have it in no other format. Do you know of a program that converts Real Audio into something else?
I believe WinAmp will do it if the .ra is not encrypted. But it would be better to go to the source of the file and ask if they have an original. They probably created the .ra from a .wav, and that .wav will be the highest quality. (And if you don't know where the file came from, it shouldn't be here anyway :-).