Quote:
Originally Posted by lumpynose
I'm guessing that Project Gutenberg makes their kindle books without compression; the difference in sizes is noticeable there. Presumably theirs are dual MOBI since they don't offer AZW3 downloads.
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Quote:
Originally Posted by DuckieTigger
I would think for compatibility it would be old mobi, not dual.
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There's no need to guess or think
reveals all.
My turn to be too lazy to check. I predict that even if newer files are dual MOBI, those that predate KF8 have not been updated to dual MOBI.