Windows NT 4.0 build 1166

Windows NT 4.0 build 1166 is a build of Windows NT 4.0.

The Workstation edition of this build was apparently scene leaked back then and was later found on 13 January 2021.

Changes

 * The Start menu banner has been updated to read "Windows NT Server" instead of "Windows NT Explorer". It also dropped the blue background color in favor of a dark-light gray gradient.
 * Windows NT Diagnostics has been updated to feature the appearance as seen in the RTM.
 * The new Setup program has been expanded further:
 * The "Welcome to Windows NT Setup" and "Finishing Setup" pages have been more finalized.
 * The ability to specify licensing modes ("Per Server" or "Per Seat") has been implemented.
 * During final phase, the new "Date/Time" Control Panel applet will launch.
 * The boot screen now displays available memory in MB instead of KB.
 * The "Drivers" Control Panel applet has been removed, while the "Multimedia" one was added.

Bugs
Most of the Microsoft Mail application is broken.