Windows 9x is the family of Microsoft Windows operating systems that comprises the 32-bit, DOS-based Windows versions: Windows 95, Windows 98, and often also Windows Me, In common usage, the term "Windows 9x" itself may or may not include Windows Me. Another term "Windows 9x/Me" is often used to explicitly include Windows Me. In the main part of this article they will be treated as synonyms. which were produced in the 1990s and 2000. All these Windows releases have internal version numbers in the 4.x series.