Windows NT 3.1 build 199
| Build of Windows NT 3.1 | |
 | |
| OS family | Windows NT |
|---|---|
| Version number | 1.0 |
| Build number | 199 |
| Architecture | x86 |
Windows NT 3.1 build 199 is a build of Windows NT 3.1, which was mentioned in the file TEXTHIST.XLS from the Windows NT 3.5 build 782.1 source code. This build was being tested on 19 September 1991, so it was almost certainly compiled shortly before that.