How do I make it so mailto: links will be registered with my program?

How would I then handle that event in my program?

Most of the solutions I found from a quick Google search are how to do this manually, but I need to do this automatically for users of my program if they click a button, such as "set as default email client".

#Edit: Removed reference to the Delphi Programming Language, because the answer is independent of your language.

windows mailto
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