Windows NT 3.51 build 976

Windows NT 3.51 build 976 is an unleaked build of Windows NT 3.51, mentioned in the file  from warez group PWA's copy of NewShell build 1054.1.

CHECKINS.TXT
Run "Checkin /?" or "ExecMail /?" for details. Please make sure you use ExecMail.Exe from NT build 976 or later.