Quote:
Originally Posted by HarryT
No, that's only for having Calibre use its internal viewer for AZW3 files. Nothing to do with adding books.
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Actually, I had the same problem as described by Kumabjorn - after updating Calibre (can't remember which version), I then tried to add books from K4PC to Calibre - and got that error - checking the AZW3 format box cured it.
[If memory serves, there's a similar question posted on Alf's blog.]