Think you can install realplayer / helixplayer.
Is there not a reallayer program installed already under multimedia.
http://www.real.com/linux
Or try as root in terminal
emerge -s realplayer
once it shows you if or what is there , should be " media-video/realplayer "
then
emerge realplayer
Kuroo on the desktop should be able to search for realplayer as well and or other software that can also play the real type files.