Windows for Workgroups 3.1 Beta 1

Windows for Workgroups 3.1 Beta 1 is the earliest known available build of Windows for Workgroups 3.1. It was leaked by Overdoze on 26 March 2021.

This build calls itself both Winball and Sparta, the codenames of Windows for Workgroups 3.1. Due to its earliness, it still uses Windows 3.1 branding in many places.