Windows Resource Protection notifies for any changes in the system files or registers in Winlogon. So SFC together with WRP provides security to critical system files, registry keys and folders. System File checker was available in the predecessors of Windows 7, 8 and Vista but what’s new with the SFC of these 3 versions is that the SFC is blended with Windows Resource Protection (WRP). System File checker is that utility which checks system files and looks for corruptions or violations of integrity in the files and restores them accordingly.