Windows NT 4.0 build 1381.1

Windows NT 4.0 build 1381.1 is the official RTM build of Windows NT 4.0, which was released to manufacturing on 31 July 1996 and generally available on 24 August 1996. This is the recompile from 3 August and the official RTM, but there is also an earlier compile from 27 July that was apparently recalled due to a bug.

Japanese Release Candidate
On 29 November 2021, Blue Horizon provided the Japanese release candidate of this build, with several notable differences compared to other variants. Both the Server and Workstation SKUs have bitmap backgrounds that identify as "Pre-Release for Evaluation", as well as additional CDs containing bug reporting tools and documentation identifying the build as the Japanese RC.