Permits or prohibits use of this snap-in. If you enable this setting, the snap-in is permitted. If you disable the setting, the snap-in is prohibited. If this setting is not configured, the setting of the Restrict users to the explicitly permitted list of snap-ins setting determines whether this snap-in is permitted or prohibited. -- If Restrict users to the explicitly permitted list of snap-ins is enabled, users cannot use any snap-in except those explicitly permitted. To explicitly permit use of this snap-in, enable this setting. If this setting is not configured (or disabled), this snap-in is prohibited. -- If Restrict users to the explicitly permitted list of snap-ins is disabled or not configured, users can use any snap-in except those explicitly prohibited. To explicitly prohibit use of this snap-in, disable this setting. If this setting is not configured (or enabled), the snap-in is permitted. When a snap-in is prohibited, it does not appear in the Add/Remove Snap-in window in MMC. Also, when a user opens a console file that includes a prohibited snap-in, the console file opens, but the prohibited snap-in does not appear. Fix: (1) GPO: User Configuration\Administrative Templates\Windows Components\Microsoft Management Console\Restricted/Permitted snap-ins!ActiveX Control (2) REG: HKEY_USERS\Software\Policies\Microsoft\MMC\{C96401CF-0E17-11D3-885B-00C04F72C717}!Restrict_Run