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Windows apps

Windows Apps were introduced in Windows 8.
Windows Apps are primarily installed from the Store App.
All UWP apps are Windows Apps, but not all Windowss Apps are UWP Apps.

Categories of Windows Apps

There are two categories of Windows Apps:
Apps are installed under %PROGRAMFILES%\WindowsApps\*`.
System Apps are installed under %SystemRoot%\*.

Classes of apps

Apps are further subdivided into
Installed apps are part of Windows.
Provisioned apps are installed into a user account the first time he or she logs in.

See also

Windows 10: types of apps

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