Windows 3.1 build 058

Windows 3.1 build 058 is an unleaked build of Windows 3.1, mentioned in internal Microsoft e-mails from January 1992, as well as December 1991, and a bug report from 9 January 1992.

The first e-mail states this build is a pre-beta build for Windows 3.1 Final Beta and was released to testers on 26 November 1991. The second e-mail describes an issue when upgrading from this build to build 061b (Final Beta candidate). Setup would always cause a general protection fault (GPF) after copying the file.

The bug report states this build displays the infamous "Non-fatal error" when installed on DR DOS 6.0, and that the problem continues in builds 060 and 061. This confirms that the AARD code was already present in this build.