Windows NT 3.1 build 257

1.257
Build of Windows NT 3.1
Screenshot
OS familyWindows NT
Version number1.0
Build number257
Architecturex86

Windows NT 3.1 build 257 is a build of Windows NT 3.1, which was mentioned in the file TEXTPERF.XLS from the Windows NT 3.5 build 782.1 source code. This build was being tested on 22 March 1992, so it was almost certainly compiled shortly before that.