App Installer

This article is about the Microsoft Windows component. For the installation of the operating system itself, see Windows Setup.
"MSIX" redirects here; not to be confused with M6.
App Installer
DeveloperMicrosoft
Initial release2016 (2016)
Stable release
1.26.510.0 / September 26, 2025 (2025-09-26)
Operating systemWindows 10, 11
TypeInstaller

App Installer is a software component of Windows 10, introduced in the 2016 Anniversary Update, used for the installation and maintenance of applications packaged in .appx or .appxbundle installation packages; they are loosely relational databases with an XML app manifest. The .appx and .appxbundle files contain either a Win32 or a Universal Windows Platform app, icons for the Start menu and taskbar, a virtualized version of any Windows Registry keys needed, and any other assets needed for the installed app to function.

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