Windows Installer XML Toolset (WiX, pronounced "wicks"), is a free software toolset that builds Windows Installer packages from XML. It consists of a command-line environment that developers may integrate into their build processes to build MSI and MSM packages. WiX was the first Microsoft project to be released under an open-source license,[2] the Common Public License.[3] It was also the first Microsoft project to be hosted on an external website.

WiX Toolset
Original author(s)Rob Mensching, Microsoft
Developer(s).NET Foundation
Initial release5 April 2004; 17 years ago (2004-04-05)[1]
Stable release
3.11.2 / 18 September 2019; 2 years ago (2019-09-18)
Written inC++, C#
Operating systemWindows
TypeSoftware development tools
LicenseMicrosoft Reciprocal License

After its release in 2004, Microsoft has used WiX to package Office 2007, SQL Server 2005, Visual Studio 2005/2008, and other products.[4]

WiX includes Votive, a Visual Studio add-in that allows creating and building WiX setup projects using the Visual Studio IDE. Votive supports syntax highlighting and IntelliSense for .wxs source files and adds a WiX setup project type .wixproj to Visual Studio.