Windows 3.x/3.1 RC1

Windows 3.1 RC1 is a release candidate version of Windows 3.1, that was shipped to testers on February 14th, 1992, as an early test of the final code.

This version is also mentioned in the Windows 3.1 Program Review from February 27th, 1992. According to the document, the following bugs were reported for this version:

All release candidate builds in that document are simply referred to as "RCX" and not by their actual hardcoded version number. A file from build 101 is versioned "3.1.0.101 (RC1)", so the RC1 referred to in that document must be a later build than 101, or at least a recompile of it.