Windows 3.1 RC1

Windows 3.1 RC1 is mentioned in an internal Microsoft document from 1992-02. This build is part of the Release Candidate stage and, like other RC builds, is not referred to by it's actual build number, but is instead simply called "RC1" everywhere.

According to the document, several third party applications were tested on this build. It was released to testers on 1992-02-14.