Windows 3.1 build 101

Windows 3.1.101 is the Release Candidate 1 build of Windows 3.1. It is mentioned in an internal Microsoft document from 1992-02, and is also often reffered to as RC1 in other documents.

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

A set of disks 2, 6, bug report disk, and test app disks of this build was found on eBay in 2018-09 and bought by AirportsFan. Files from these disks confirm that build 101 is indeed the first release candidate of Windows 3.1.

File version
The file  from Windows for Workgroups 3.11.411 has version number , suggesting that the RC1 of Windows 3.1 was build 101 before this was confirmed by the partial leak.