Windows NT 4.0 build 1166

Windows NT 4.0 build 1166 is a build of Windows NT 4.0. It removes some of the Windows NT 3.x programs, updates the Start menu banner from "Windows NT Explorer" to "Windows NT Server" and has updated NT Diagnosis, but most of the Microsoft Mail application is broken.

The Workstation edition of this build was apparently also scene leaked at the time and was later found on 13 January 2021.

Changes

 * The new Setup program has been expanded further:
 * The "Welcome to Windows NT Setup" and "Finishing Setup" pages have been more finalized.
 * During final phase, the new "Date/Time" Control Panel applet will launch.
 * The boot screen now displays available memory in MB instead of KB.
 * This is the first build to have Windows NT Diagnostics.