User Configuration > Administrative Templates > Microsoft Office 2016 > AutoSave
User
HKCU\software\policies\microsoft\office\16.0\excel
Important: This policy setting will be removed in a future release and will no longer be supported. Please use the "Turn off AutoSave by default in Excel" policy setting instead. This policy setting controls whether files can be AutoSaved in the desktop version of Excel after Excel has been updated with new features. By default, Auto Saving files is Enabled. If you enable this policy setting files will not be able to be AutoSaved. If you disable or don’t configure this policy setting files will be able to be AutoSaved. Note: There are separate policy settings for Word, Excel, and PowerPoint.