Microsoft releases Windows 3.1, priced around $149, selling three million copies in its first two months.The release improved stability and usability over earlier versions and brought built-in multimedia support, including sound cards, MIDI, and CD audio capabilities. It also expanded support for Super VGA graphics (such as 800x600 resolution), depending on hardware. For many of us, this was the first version of Windows we actually used, as earlier versions were still gaining traction. Windows 95 wouldn't arrive until three years later.
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https://grokipedia.com/page/Windows_3.1]
https://grokipedia.com/page/Windows_3.1