How to detect if an application already exists？

Question

For example, program A runtime to detect whether B has been installed

Answer 1

One way to know it through registry

HKEY_CURRENT_USER\Software\Classes\ActivatableClasses\Package

each metro app will have entry here.Each metro app will have Key with be same name as package family name in package.manifest file of your your metro app.

Answer 2

There is no way to do this from within a Windows Store app. From a desktop app you can use the PackageManager API or PowerShell's appx installation cmdlets.

--Rob

Answer 3

Metro app can use registry ?

how to use ?

how to read " HKEY_CURRENT_USER\Software\Classes\ActivatableClasses\Package"

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