Microsoft needs to either fix their un-installation procedure that properly removes the registry items I mentioned in the linked thread or they need to fix how the Windows preview pane handles office files. If a user installs 64-bit Office first then uninstalls it and installs the 32-bit version then the error will occur every time if they use the Windows preview pane. It should be noted this is 100% a Microsoft issue. I'm wondering could it be that the Preview Pane is running in some kind of "sandbox" mode where it doesn't have access to the Registry key? Is there anything we can do to prevent our Add-in loading when Excel is running in "preview" mode? But on the user's machine it seems to eventually lead to the error message popping up. On my own machine this doesn't seem to affect anything other than that Excel keeps on running for no good reason. When they click on another document I see that Excel continues to run. When they happen to click on a spreadsheet, I see in my task manager that Excel starts running and the preview appears in the Preview Pane. The issue happens when the user is using the Preview pane in their Windows Explorer. I can reproduce some of this on my own machine also - I can reproduce the fact that Excel starts and never stops, but I don't get the error popping up on my machine. We now have some new information that may help us figure out what is going on. Where occasionally we would get an error message "Exception Message: Requested registry access is not allowed."
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