Windows 3.0 build 13

Windows 3.0 build 13 is an unleaked build of Windows 3.0, which was found in an antitrust document dated 8 February 1989. from build 55 contains the following string: Microsoft Windows Old Application Support Module (3.00.14.20jan89) This suggests that build 14 was already compiled around 20 January 1989. Therefore, build 13 was almost certainly also compiled in January 1989.