This policy setting allows you to permit or prohibit use of Application snap-ins (Application preference item types). When prohibited, no Application preference item types appear when you attempt to create a new Application preference item, and you are unable to do so. This policy setting does not affect existing Application preference items.
If you enable or do not configure this policy setting, you permit use of Application snap-ins. Enabling this policy setting does not override policy settings that restrict the use of preference extensions.
If you disable this policy setting, you prohibit use of Applications snap-ins, and new Application preference items cannot be created.