Not sure it is a bug.You can get the same problem with browsers
Install RealPlayer,update it to format you know you use or you have on your hard drive.DESELECT ALL FILE ASSOCIATION in Real8.
Means if you do not have more music programs ALL your file have to get the Windows MediaPlayer icones.
Install MJ.BEFORE you run it searching for songs on your drive.open WindowsMediaPlayer and de select any files association.
You would have no problem .Well WMP would behave itself.But some files will open RealPlayer.
I do not know if still the case,but i remember than when opening a file in MJ that needed a update from RealPlayer,when clicking on "get the plugin or update" you got the RealOne page or you downloaded RealOne.
If you still have this kind of problem:close MJ.Click again on the link in the page where the stream,video is but with 'open with'==RealPlayer.You will get a pop up windows telling you That RealPlayer needs to download ....to play this file.Download and it is ok.
If you cannot open the links with 'open it',can be a stream just opening on one click,in this case open RealPlayer set it default to all,click the stream and like i said before.
When you get the download and you see the stream plays,stop it and reset RealPlayer default to NADA =nothing.
If you really want to have MJ to open most of the time instead of RealPlayer,you have to know that it is a HARD job...........
Next time how to set from Explorer=tools=folder options=files types
A kind of Blood Sweat and Tears,but if you are a hardcore anti RealPlayer pop up...........
Look like there is no way to get RealOne the behave in a polite way.
Now if having MJ and RealPlayer working fine,reading this forum,you still install RealOne,you deserve the troubles you get.There is NOTHING new in RealOne,you get the new codex having only RealPlayer