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maybe try this?
1. Go to applications, find calibre
2. right click, show package contents
3. go into Contents
4. copy and paste the ebook-viewer into Applications (i assume if its missing from there it will cause problems, it's only 50MB anyways)
5. do open with, other, enable all applications, select ebook-viewer, always open with
i don't have the file type that you were looking for but it seemed to work for a .png file
the only problem is that in macos opening a file like that steals the current ebook window, it doesn't create a new window which i find annoying so i always open from calibre lol
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