My Itunes will not open my mr4?

I have switched them and when I try to open it in itunes it will not happen I reccently got the iphone 5 and i'm up to date with all the updates and I'm super frustrated I have tried apps websites and even making them on my own can someone help me please I would gladly appreciate it

Check this page http://pcsupport.about.com/od/fileextensions/f/m4r-file.htm

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