Quote:
Originally Posted by Snekguy
I used the editor to change the file extensions in the Calibre 'edit book' menu.
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You can't manually change a file extension in isolation without "breaking" other things. Did you also make the necessary related changes to OPF, TOC, NCX/NAV plus any hyperlinks (e.g. footnote and index)?
Using the calibre Editor utility (mentioned in post #2) to do the extension rename would have automatically cleaned up the collateral damage.