Windows NT 3.1 build 528

Windows NT 3.1 build 528.1 is the second RTM build of Windows NT 3.1, released 2 months after the original RTM (build 511). It introduced support for the Alpha architecture and included the first set of bugfixes for build 511, which were also released separately in the form of a service pack. This build is also often referred as the Service Pack 3 of Windows NT 3.1. It is available as a full operating system and as an update for build 511.1.