Today I stumbled upon the fact that even simple, non-Internetty modern/Metro Windows apps can be associated with URI protocols. For example, the Calculator will come up if you run calculator:// from the Run dialog - or even from Chrome's address bar.
You can explore protocol registrations in the Registry under this key:
HKEY_CLASSES_ROOT\Extensions\ContractId\Windows.Protocol\PackageId
Each application's subkey has an ActivatableClassId, which contains one subkey for each protocol. The protocol name is stored in the Name value of the CustomProperties subkey.
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