Turn off Internet File Association service This policy setting specifies whether to use the Microsoft Web service for finding an application to open a file with an unhandled file association. When a user opens a file that has an extension that is not associated with any applications on the computer, the user is given the choice to select a local application or use the Web service to find an application. If you enable this policy setting, the link and the dialog for using the Web service to open an unhandled file association are removed. If you disable or do not configure this policy setting, the user is allowed to use the Web service.

(1) GPO: User Configuration\Administrative Templates\System\Internet Communication Management\Internet Communication settings!Turn off Internet File Association service (2) REG: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer!NoInternetOpenWith