Several people have asked for changes to this plugin to enable merging AZW3 and AZW6 files from books extracted from Kindle devices such as the Paperwhite 1 (5th gen). Since ATimson has not posted here on MobileRead for several months, I took a look at this plugin and came up with a new version (1.1.0) to add that functionality.
The revised plugin file is attached. (Hopefully ATimson will not be offended by my stepping in to update the plugin.)
The changes are:
Handle the file layout of books on e-ink Kindle devices. The plugin will now look for a .azw6 file in the .sdr folder associated with the book.
Images in a .azw6 file from a Kindle device are often in JPEG-XR format. These will be converted to JPEG so that they will be rendered properly.
Fix a bug that would sometimes cause images to be replaced by a different image than the intended one.
A further update to this plugin has been made by DuckieTigger. See this post for details.