Being able to play a certain type of movies has nothing to do with the player but rather with having an appropriate CODEC for it.
Real and QuickTime are both proprietary codecs, meaning that they are designed in such a way you can only use them
with their own players (which suck).
However there's light at the end of the tunnel:
Go to
http://www.kazaalite.tk and follow the links to "Quicktime Alternative" and "Real Alternative".
You will be able to download hacked (and probably illegal) codecs that allow you to play Quicktime and Real files
with any other player (including BSPlayer).
Cheers,
Smarties