Development environment


After selecting CSV in the file app, you may see the following screen,
I'm looking for ways to add my app to this list of selectable apps.
I tried various things on my own, but I can't find a page that matches my intention, whether the search is bad.
Isn't it possible to borrow the wisdom of someone because it can be very helpful even if you provide a link to a Web page that can be used as a reference, even if it is a specific method?