The Cakewalk 6.0x Export to RA function was designed using RA 4.0, and does not work if you have installed RA5 or G2. Cakewalk versions 7 and above do not
exhibit this problem.
There is a workaround for Cakewalk 6 users:
Export from Cakewalk as a wave file and use the RealEncoder software offered by Real Audio.
www.realnetworks.com has the software
required to convert WAV files to Real Audio format.