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defaults write -g NSFileViewer -string info.filesmanager.Files
Some naughty apps tend to call Finder to view a folder, file etc., and that's annoying because it brings Finder to the front, or (as in my case) if Finder has been completely disabled, macOS then launches the Finder app. The above command will change that and make NC the default. (Reboot or at least login/logout might be necessary.)