Quote:
Originally Posted by romad
Well, on my Mac I have a folder named Calibre Library where the folders are alphabetized by the authors first name (don't know why not by last name). In the author folder are folders for each title by that author which contain 4 files: cover.jpg, metadata.opf, book title.azw3, and book title.epub. You could manually delete the unwanted book title files.
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Manually doing something with the files in the library folder is an absolute no-no. Calibre won't record those changes in its database and you'll end up with a seriously messed up library.
BetterRed described the quickest way to get rid of a certain format.