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Despite the warning you *can* add files to the book's folder-but Calibre will ignore them. For the example you cite I'd say your best option would be to edit the HTML/ePub so the book links properly to the sample files. You'd need to copy the sample files manually though, keeping them in the same relative position vis-a-vis the book (e.g. in the same folder). You'd also need to know some HTML-please note that I'm *not* recommending this as it's easy to mess things up when editing generated HTML, but it certainly is possible.
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