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Calibre stores an opf file with every book in its library, changing it every time the metadata for the book is changed. The files are used by the restore database function to recreate calibre's database (metadata.db) in the case that the db has become corrupted.
You cannot turn off this behavior. You can, of course, delete the files, but by doing so you are potentially shooting yourself in the foot by depriving yourself of a way to recover your library if something goes wrong with the db.
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