The RealJukebox Format is stored in the RMX format and is affixed with the RMX extension, and was used by the RealPlayer program. These RMX files are generally classified as audio files that contain audio data played only through a security key or linked to a particular computer.
Please be aware that as of October 31, 2011, Rhapsody/RealNetworks no longer support certain music files purchased before July 2008. This means that everything you've purchased from Rhapsody or RealNetworks Music Store prior to July 2008 in a .rax or .rmx format needs to be burned to an audio CD. Once you take this small step, you can continue to play them on your audio CD or rip them to any format you desire and play them on your PC.
If you have any further questions about RealPlayer Music Store tracks, please contact Rhapsody Customer Support using below link: