File-Extensions.org forum

Hi, I'm using new Macbook Pro with clean OS X El Capitan and can't open common message .msg file saved from Outlook. Is there some app for this? I can't find it. I have installed also Microsoft Outlook from and does not open it too. Only show me a new message with msg file attachment. I need to view...

I downloaded program from internet and it has rpm file extension. I does not work. How do I install it?
Thanks