OS/2 2.00 build 6.43

OS/2 2.00 build 6.43 is an unconfirmed beta build of OS/2 2.0. According to Michal Necasek, author of the OS/2 Museum blog, it was developed by Microsoft in December 1989 and released in January 1990 as part of the first OS/2 2.0 SDK.