I've just tried Media Player Classic, from
http://sourceforge.net/projects/guliverkli
or as a package in FinalBuild's site,
http://home.hccnet.nl/h.edskes/finalbuilds.htm
Like what adicoto said, Quicktime works fine in it. I also tested the .rm file which I was unable to play in BSPlayer and it worked fine too. I think there must be some code inherent in MPC that allows both Real and QT to work properly, and that is probably why Real couldn't fully work in BSPlayer and WMP (yes you can play them in there too, as long as you got the codec and splitter), and QT not being able to at all.