This policy setting allows you to specify a location containing files that should always open in Protected View. If you enable ...

This policy setting allows you to specify a location containing files that should always open in Protected View.

If you enable this policy setting, you can specify a location containing files that always open in Protected View.  If you check the "Allow sub folders" option, sub folders will also be included.

If you disable or do not configure this policy setting, only the downloads folder and the temporary Internet files folder will be considered unsafe locations.