Thanks for the quick reply. That helps a lot. I now see that books downloaded directly to my Kindle from Amazon have a separate APNX file; but if they're downloaded directly to my computer (or Kindle for PC) they don't. Similarly, a book transferred by Calibre's "Send to Device" ends up with an APNX file on my Kindle, but if I use Windows Explorer, I can just copy the .mobi file from My Calibre Library to my Kindle's Documents folder and, presumably, match up the name with the Amazon APNX file. I'm going to have to experiment a bit!
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