Clear history of recently opened documents on exit
User Configuration\AdministrativeTemplates\Start Menu & Taskbar
Directs the system to delete the contents of the Documents menu on the Start menu when the user logs off.
The Documents menu contains shortcuts to the non-program files the user opened most recently.
If you enable this policy, the Documents menu is always empty when the user logs on. Otherwise, when the user logs on again, the Documents menu appears just as it did when the user logged off.
You can use this policy, in coordination with the Remove Documents menu from Start Menu and Do not keep history of recently opened documents policies in this folder to customize your policy for managing access to recently opened files. The system uses this policy only when neither of these related policies are selected.