What is an Extension in a Windows Store app
What is an Extension in a Windows Store app
Extensions An extension is like an agreement between an app and Windows. Extensions lets app developers extend or customize standard Windows features primarily for use in their apps and potentially for use in other apps.
Use the package manifest to declare extensions. For example, an app can declare that it handles files with certain file extensions, or it can declare that it uses a particular dynamic-link library.
Learn more here >