Windows 3.1 build 060

Windows 3.1 build 060 is an unleaked build of Windows 3.1, mentioned in internal Microsoft e-mails from 1992-01 and in a bug report from 1992-01-09.

The e-mail states this build is a pre-beta build for Windows 3.1 Final Beta and was released to testers on 1991-12-06. The bug report states this build displays the infamous "Non-fatal error" when installed on DR DOS 6.0, and that the problem is also present in builds 058 and 061.