Windows: how to find the shortcut, using the shortcut key

I have created a Windows shortcut for launching Notepad, and I have added the shortcut key "Ctrl+Alt+N". As a result, when I press "Ctrl+Alt+N", Notepad starts up.
Now I'm working more and more with files, coming from UNIX machines, which Notepad does not display very well, so I would like to modify the behaviour of the shortcut key into starting Notepad++.

This is very easy: just go to the Notepad shortcut, remove the shortcut key, create a new shortcut for Notepad++ and fill in the "Ctrl+Alt+N" key in there.

The main question however is: I don't know where I have stored that shortcut. Does anybody know how to find a shortcut in Windows, based on the shortcut key?

For your information, I have already tried creating a new shortcut (to Notepad++) and press "Ctrl+Alt+N" as the shortcut key, but when I do this, Notepad is started up :-)

I'm working on a Windows 7 system.

Thanks
Dominique