Subsystem for 32-bit Windows for running 16-bit Windows programs
This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)
This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "Windows on Windows" – news · newspapers · books · scholar · JSTOR(October 2018) (Learn how and when to remove this message)
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Windows on Windows" – news · newspapers · books · scholar · JSTOR(October 2018) (Learn how and when to remove this message)
(Learn how and when to remove this message)
This article is about the 16-bit subsystem in the 32-bit editions of Windows NT. For the 32-bit compatibility layer in the 64-bit editions, see WoW64.
Windows on Windows
Other names
WOW
Developer(s)
Microsoft
Initial release
July 27, 1993; 30 years ago (1993-07-27)
Operating system
Microsoft Windows
Platform
IA-32
Type
Compatibility layer
License
Proprietary commercial software
In computing, Windows on Windows (commonly referred to as WOW)[1][2][3] was a compatibility layer of 32-bit versions of the Windows NT family of operating systems since 1993 with the release of Windows NT 3.1, which extends NTVDM to provide limited support for running legacy 16-bit programs written for Windows 3.x or earlier. There is a similar subsystem, known as WoW64, on 64-bit Windows versions that runs 32-bit programs.
This subsystem has since been discontinued, as Windows 11 (and Windows Server 2008 R2 and later) are only available in 64-bit editions and therefore cannot run 16-bit software without third-party emulation software (e.g. DOSBox). Windows 10 is the final version of Windows to include this subsystem.
^"WOW Environment Remains in Memory After Quitting 16-Bit Program". Support. Microsoft. February 22, 2007. Archived from the original on October 23, 2007. Retrieved February 7, 2017.
^"Starting 16-Bit WOW Subsystem on Windows NT Server". Support. Microsoft. November 1, 2016. Archived from the original on May 9, 2007. Retrieved February 7, 2017.
^"Disabling the MSDOS and WOWEXEC Subsystems on Terminal Server". Support. Microsoft. November 1, 2006. Archived from the original on January 13, 2008. Retrieved February 7, 2017.
and 28 Related for: Windows on Windows information
families include Windows 9x, Windows Mobile, Windows Phone, and Windows Embedded Compact. The first version of Windows was released on November 20, 1985...
In computing, WindowsonWindows (commonly referred to as WOW) was a compatibility layer of 32-bit versions of the Windows NT family of operating systems...
Windows 10 is a major release of Microsoft's Windows NT operating system. It is the direct successor to Windows 8.1, which was released nearly two years...
Windows 7 is a major release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on July 22, 2009, and became...
referred to as a window. Many glazed windows may be opened, to allow ventilation, or closed, to exclude inclement weather. Windows may have a latch or...
Windows 10 is a major release of the Windows NT operating system developed by Microsoft. Microsoft described Windows 10 as an "operating system as a service"...
Windows 11 is the latest major release of Microsoft's Windows NT operating system, released on October 5, 2021. It succeeded Windows 10 (2015) and is available...
which was released on July 27, 1993, and it lives on today since the latest version of Windows, 11, includes its technology. The Windows NT name denotes...
Windows Vista is a major release of the Windows NT operating system developed by Microsoft. It was the direct successor to Windows XP, released five years...
Windows 98 is a consumer-oriented operating system developed by Microsoft as part of its Windows 9x family of Microsoft Windows operating systems. It...
Windows Phone (WP) is a discontinued mobile operating system developed by Microsoft for smartphones as the replacement successor to Windows Mobile and...
Windows 8 is a major release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on August 1, 2012, and was made...
on personal computers, including desktop computers, laptops, and workstations. The first five versions of Windows–Windows 1.0, Windows 2.0, Windows 2...
introduced by Windows Aero encompassed many elements of the Windows interface, with the introduction of a new visual style with an emphasis on animation,...
Windows 9x is a generic term referring to a series of Microsoft Windows computer operating systems produced from 1995 to 2000, which were based on the...
Windows XP is a major release of Microsoft's Windows NT operating system. It was released to manufacturing on August 24, 2001, and later to retail on...
Windows Millennium Edition, or Windows Me (marketed with the pronunciation of the pronoun "me"), often capitalized as Windows ME, is an operating system...
Windows 11 is a major release of the Windows NT developed by Microsoft that was released in October 2021. Starting with Windows 10, Microsoft described...
editions. Home Windows 10 Home is designed for use in PCs, tablets and 2-in-1 PCs. It includes all features directed at consumers. Pro Windows 10 Pro includes...
Windows Server (formerly Windows NT Server) is a group of server operating systems (OS) that has been developed by Microsoft since 1993. The first OS that...
The Windows Registry is a hierarchical database that stores low-level settings for the Microsoft Windows operating system and for applications that opt...
Windows 2000 is a major release of the Windows NT operating system developed by Microsoft and designed for businesses as the direct successor to Windows...
Windows Update is a Microsoft service for the Windows 9x and Windows NT families of the Microsoft Windows operating system, which automates downloading...
Windows 95 is a consumer-oriented operating system developed by Microsoft as part of its Windows 9x family of operating systems. The first operating system...
Windows XP, which is the next version of Windows NT after Windows 2000 and the successor to the consumer-oriented Windows Me, has been released in several...
to subscribe to Windows Live OneCare. Also, Windows Mail, Windows Photo Gallery and Windows Movie Maker were not offered with Windows 7 and became an...
to Windows CE in 1996, though Windows Mobile itself first appeared in 2000 as Pocket PC 2000 which ran on Pocket PC PDAs. It was renamed "Windows Mobile"...
contact. Milestone 3 is the first version of Windows Live Messenger to use the standard window frame onWindows Vista in accordance with the user experience...