Quote:
Originally Posted by fan of kovid
Calibre creates and stores two extra files - "cover.jpg" and "metadata.opf" and stores these in the folder with the epub file.
Since the epub file is really just a renamed zip file, is it not possible to simply add these two extra files into the epub - then the book, with cover and metadata are less likely to become separated?
I have tried doing this manually, and it seems to work okay - is there some reason why they need to be separate files?
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Equivalents of the two files already are stored in the EPUB, provided you want them there. EPUBs have a cover image and a content.opf. The two files stored externally ensure that you can easily recover the database, even if you have no EPUB formats.