Make invisible files that don’t appear in the Finder visible, so you can easily open them in CotEditor.
Go to the CotEditor app
on your Mac.
Choose File > Open.
Select “Show hidden files.”
In the CotEditor app
on your Mac, open a folder.
Open the context menu in the file browser on the sidebar.
Choose Show Hidden Files.
To hide hidden files again, select Show Hidden Files once more and remove the check mark.