I'm not sure if this is related to SDK's problem, but I'm also having an issue with using ebook-viewer as a default app for epubs. I can open ebook-viewer as a standalone app fine, but if I try to open an ePub or Mobi *with* ebook-viewer, nothing happens. Is this the expected behaviour, or is something wrong? I'd like to use ebook-viewer as the default reader, *even without adding things to the Calibre library*. (Calibre 5.7.2, Catalina 10.15.7, "normal" dmg installer)
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