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Is Windows 3.1 still in use?
What is the difference between Windows 3.1 and Windows 95?
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Windows 3.1x
Software
Windows 3.1 is a major release of Microsoft Windows. It was released to manufacturing on April 6, 1992, as a successor to Windows 3.0.
Like its predecessors, the Windows 3.1 series ran as a shell on top of MS-DOS. Windows 3.1 introduced the... Wikipedia
Microsoft Windows Installer is a component of your Windows operating system that provides a standard foundation for installing and uninstalling software.