Windows 3.1 build 043e

Windows 3.1 build 043e is the official Beta Release 2 of Windows 3.1. Prior to it being uploaded to BetaArchive on 4 March 2014, it was commonly believed to be a typo of build 034e, itself a mislabel of build 034f, which was already available. This build has an early tutorial and Reversi has been removed and replaced by Minesweeper.

This build was also mentioned by internal Microsoft e-mails from late August 1991, as well as build 061d's  file.

Another e-mail from late December 1991 discusses sending "WFP SDK 1.0 Alpha (Kanji version)" and "WIN3.1 Beta2 (Kj)" to IBM Japan. It is unclear whether Beta 2 refers to this build (suggesting there is a Japanese version of it as well) or some other build from the Beta 2 stage.