Quote:
Originally Posted by usedtowork
So if metadata's got you down, try cleaning it with Sigil first, but if that fails delete the metadata.opf files and you should be able to scrub your books clean.
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As itimpi said these files are essentially a backup of what is in your calibre database and were created and are used as a backup of your database one book at a time. if your metadata.db file ever disappears these files will help you restore the database. Deleting these files in the short term won't hurt but they won't help either.