Quote:
Originally Posted by TheArtfulDodger
1. Book.azw3
2. Book.epub
3. cover.jpg
4. metadata.opf
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In this listing 1 & 2 are ebook formats. The 3rd & 4th items are files that calibre uses as needed (cover.jpg=cover image; metadata.opf=extra copy of book's metadata), make believe these files don't exist. It is these files which help to rebuild your calibre library (metadata.db) if it is corrupted which is why you should leave them alone. Calibre will manage things quietly as needed.