Windows 3.1x

Windows 3.1x is a family of Windows versions following Windows 3.0. The first release was Windows 3.1 in 1992, followed by Windows 3.11 in 1993 which included only bug fixes and was also available free of charge from Microsoft. Windows for Workgroups 3.1 was released alongside Windows 3.1 in 1992 and featured support for networking. It was updated to Windows for Workgroups 3.11 in 1993. A separate simplified-Chinese release called Windows 3.2 was also made, fixing problems related to the input of Chinese characters.

Improvements over Windows 3.0
Windows 3.1 dropped support for Real mode, thus running only in Standard and 386 Enhanced modes. Support for CGA displays was also dropped. It added TrueType support and included multimedia components by default. System stability was greatly increased compared to Windows 3.0, while the user interface was refined and improved.

Windows for Workgroups 3.11 dropped support for Standard mode as well, now running only in 386 Enhanced mode.