Windows 3.0 undated 1989 build

An undated screenshot of what is presumed to be a pre-release build of Windows 3.0 was shown by Craig Brockschmidt, the developer of the Windows 3.0 Calculator application, running Calculator version 3.00.13 on his website. Given that the calculator in build 55 has the version number of 3.00.16, this particular build is likely earlier than that.

A video of what is claimed to be build 48 and which clearly aims to replicate the build shown in Brockschmidt's screenshot was posted to YouTube in June 2020; however, the legitimacy of the video has yet to be proven.

It is also the first known build to have the Program Manager.