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#11
That sounds like a related, but different issue. The problem appears to be that you're running the Notes client in an elevated context, and Windows does not allow dragging and dropping files between user contexts (ie from normal user to administrative user). This is to prevent "Shatter attacks", which were a specific type of exploit a while back (some "researcher" wrote a big paper about it, claiming it was impossible to fix... except that Microsoft then proceeded to fix it in Vista).
Have you tried dragging the xml out of the browser and dropping it somewhere as an intermediary (say, to the desktop or a folder) and then dragging it the Notes client? You might also have to "Unblock" the file (right click on it, choose properties, and click unblock).