File menu: Disable closing the browser and Explorer windows

Supported on: At least Internet Explorer 5.0

Registry

HKCU Software\Policies\Microsoft\Internet Explorer\Restrictions

Value name: NoBrowserClose

Description

Prevents users from closing Microsoft Internet Explorer and File Explorer. If you enable this policy, the Close command on the File menu will appear dimmed. If you disable this policy or do not configure it, users are not prevented from closing the browser or File Explorer. Note: The Close button in the top right corner of the program will not work; if users click the Close button, they will be informed that the command is not available.