Difference between a Registered Application and Non-Registered app

What is the difference  between a Registered  Application and Non-Registered app?

Why do we register an application in the windows registry?
Lawrence AverySystem DeveloperAsked:
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Jacques Bourgeois (James Burger)PresidentCommented:
You usually do not register an application, you register a dll.

Applications need to be registered only when they have been designed to be used by other applications, which is almost the equivalent as a dll. An example of this is Excel (or Word or any Office application). Although Excel is first an application, it can be controlled by other applications through COM/ActiveX/OLE. For that to work, it needs to be registered in the registry.
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