Quote:
Originally Posted by mbovenka
That alone won't work; 'Remove all formats, except...' will not remove formats from books that don't have the 'except' format. One of Kovids' buit-in safety measures
But followed by 'not formats:epub" will let the OP delete all books that didn't have an epub in the first place.
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Teach me not to post solutions that I haven't actually tried.