Stick with widely known, widely understood formats, like *.WAV [frankly, I wouldn't do anything with music unless it was *.WAV].
Also, I'd try to stick to the simplest visual formats as well, like HTML + Javascript [you can do your visuals in MSFT Powerpoint, and save them to HTML + Javascript].
Java is iffy [I don't know whether Java interpreters will be able to run 2008-ish Java stuff in another 10 or 15 years], and Shockwave/Flash is extremely iffy [it's such a new standard that I just don't know what will happen to it in another decade].
If you save all your work to some bizarre, weirdo format, then prepared for it to be obsolete in another five or ten years [as you're discovering now with Real Audio, which seemed like a very mainstream format as recently as five years ago].
I used to could watch youtube videos on my computer. After I upgraded a newer version of firefox, I could no longer watch them. Anyhow, When the YT would play there was a pop-up that would let me download the video into real player, that’s what I did. I figured it was a way to save on bandwidth.(hughesnet)
Stick with widely known, widely understood formats, like *.WAV [frankly, I wouldn’t do anything with music unless it was *.WAV].