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It seems that on some systems, IE has trouble displaying some .eml files and instead launches the associated application. I don't know what Windows/IE setting results in this behavior, and only saw it on one Win 8.1 box (it worked in my tests on another Win 8.1 system, Win 7, and Win 2003).
Try removing .eml from Tools | Options | Browser | File extensions to display in internal browser view and adding to Tools | Options | Documents | File extensions to display in MIME viewer or Tools | Options | Editor | File extensions to display in text editor. Also try removing .eml from the Browser, MIME, and Editor options -- on the Win 8.1 box that was displaying the message externally, removing .eml from all options resulted in the message displaying properly within UR.
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