Quote:
Originally Posted by like00111
So I have to delete all them files and replace them with MOBI?
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like00111 - no, you must add the MOBI files to the library via one of the Add Books variants.
Leave the OPF (Open Packaging Format) files alone, they backup the library database (metadata.db); should it get corrupted they are used in restoring the database.
Have you taken the opportunity of viewing the
Tutorial Videos, IMO they are the best way to get to grips with calibre - watch a section, pause, do what it covered, do a few variants, watch next section, pause...
BR