No need to install the bulky codec pack... if you have mpc or mpc-hc(recommended), Launch the player and press "O", go to "internal Filters" > and tick "Realmedia"


Second: if you have k-lite codec pack installed or just ffdshow-tryout.
go to start menu and search for "FFdshow audio decoder configuration", and the video configuration too.
Launch the audio decoder configurator and go to "Codec", searc for "Real audio" and "Cook" and change the decoder from "Disable" to "libavcodec"


Same for video decoder configuration:


FFdshow FTW