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I was able to reproduce this behavior. When using the UR internal browser view (Tools | Options | Browser) to view .msg files, UR hosts an embedded instance of IE, which in turns hosts Outlook to display the formatted message. UR creates the temp .msg file, but it doesn't keep it open. There seems to be some sort of conflict between IE and Outlook when viewing some messages in this way, resulting in the error.
One option would be to instead use the MIME viewer (Tools | Options | Documents) or text editor (Tools | Options | Editor) for displaying .msg files in UR. You can also use Item | Open Document (Ctrl+J) to open the item externally in Outlook when needed.
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