Do not keep history of recently opened documents
User Configuration\AdministrativeTemplates\Start Menu & Taskbar
Prevents the system from saving shortcuts to documents the user has most recently opened.
By default, the system saves a shortcut to each of the non-program files the user most recently opened and displays the shortcuts on the Start menu under Documents. The shortcuts let users easily review and restart recently used documents.
If you enable this policy, the system does not save shortcuts to the Documents menu.
You can use this policy, in coordination with the Remove Documents menu from Start Menu and Clear history of recently opened documents policies in this folder, to customize your policy for managing access to recently opened files.
If you enable this policy and do not select the Remove Documents menu from Start Menu policy, the Documents menu appears on the Start menu, but it is empty.