Windows NT 3.1 build 290

Windows NT 3.1 build 1.290 is a build of Windows NT 3.1, which was mentioned in the file  from the Windows NT 3.5 build 782.1 source code. This build was being tested on 24 June 1992, so it was almost certainly compiled shortly before that.

This is the last known build of Windows NT to have a kernel version of 1, as the next build jumped to 3.10 to correspond with Windows 3.1.