The file association for .txt in my OS is to open it in notepad (a simple text editor), since I do a lot of things with text files that are not ebooks. The file association I want _within_ Calibre is to open .txt files in yBook since, within Calibre, I only expect to open ebooks for reading, not text files for editing.
Do you mean there are two file associations to be set within Calibre? I can't find where "behaviour 'use internal viewer' for txt" is.
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