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HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\excel\security\external content
Always prevent untrusted Microsoft Query files from opening
HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\excel\security\external content\
enableblockunsecurequeryfiles
Don't allow Dynamic Data Exchange (DDE) server launch in Excel
HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\excel\security\external content\
disableddeserverlaunch
Don't allow Dynamic Data Exchange (DDE) server lookup in Excel
HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\excel\security\external content\
disableddeserverlookup
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