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?
Answer # 1
I'm sorry for the appropriate answer
↓ Here, (it is quite old)
If you look at UTI (Uniform Type Identifiers), it will come out.
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