Change calculator launched by shortcut

Question

I am running Windows 11 professional. I have a Logitech keyboard with some function keys. The calculator key, which the Power Toys application labels the "Start App 2" key, launches the Windows calculator. I would to launch a different calculator application, but can not find where I can modify the program launched by the key. I would like to just go into wherever the system stored the relationship between the key and the action and change it there, and not to create some chain of redirects.