Windows 3.1 build 034f

Windows 3.1 build 034f is the official Beta Release 1 of Windows 3.1. This build was originally provided by an OSBetaArchive member, whose 5.25" copy had the second floppy disk unreadable, leading other community members to rebuild it using files from other builds. This also meant that the build has been mislabeled as build 034e for a long time, as the  file holding the actual build number was included on the broken disk. In late 2020, community member ReflectiaX obtained a 3.5" copy of this build. He then dumped his disks in January 2021, clearing out any doubts about the build. This build was also reviewed in the December 1991 issue of Yugoslavian computer magazine Računari ("Computers").

It is the last build of Windows that includes Reversi. It is also the last build of Windows to run in Real Mode, as subsequent builds dropped support for the Intel 8086/8088 and its variants.

New features and changes

 * Setup has a new interface, letting the user choose either "Quick install" (Default) or "Full install" (Custom).
 * This is one of the earliest builds to include Dr. Watson. It and starts automatically with Windows. In this build, it has a unique icon and has the version number of 0.73.
 * Object Packager has a unique icon and name in this build.
 * This is currently the earliest available build of Windows 3.1 to have built-in Video 7 VGA drivers.

Bugs and quirks
The Set Up Applications part of setup may detect non-existent programs and attempt to find them.