Always warnings when opening a .txt file

Hi, always when I am trying to open a .txt file I get the same annoying warning about configuring an external editor. I have done that and I still get the same warning.
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I guess you are using "open" command (or double-click) instead of "edit". Are you?

Yes, shouldn't work with "open" ?

Yes, shouldn't work with "open" ?

No it cannot.