Windows NT 3.1 build 531

Windows NT 3.1 build 531.1 is the official Japanese RTM of Windows NT 3.1. The free build for Alpha and the checked build for x86 is available on a MSDN CD from April 1994. BetaArchive member ReflectiaX showed the 3.5inch 2HD floppy variation of this build’s Box for the NEC PC-9800 Series Computers.