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Okay, then time to brainstorm some possible work arounds.
Right now it is possible to add an apnx file to the library for a book, so that step is taken care of. However, the user has no way of instructing calibre to send this format to the device. The "Send to device" option automatically sends the book itself using the preference list for the driver to determine the format. This should not be messed with, but we still need a way to instruct calibre to send the apnx file.
The "Send specific format to..." option allows the user to pick the format that the book is sent in, but only displays formats which are device compatible. For my kindle that's azw3, mobi, pdf, and txt. I suppose apnx could be added to this list, but I'm not sure this is the best solution as it might imply that apnx was a book format (since it would appear in a list with other book formats).
When a book is displayed, the sidebar has a "Formats" line which lists the apnx file (along with anything else for the book). Right clicking on this entry displays a context menu with "Copy", "Delete the * format", and "Save the * format to disk" as options (where * is the name of the format). Perhaps "Send the * format to device" could be added to this list? This would allow users to send any file in their library to the device. There is, of course, no guaruntee that the device would know what to do with the file, but at least in this particular case it is potentially useful.
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