Originally Posted by gus.is.here
In the plugin preferences page, I find File type plugins ->HTML to ZIP (0.7.18). Customize plugin only shows a dialog asking for the text encoding.
It is amazing that the version you are using is almost exactly 1 year and 59 versions away from being current. If you were running 0.8.18 you would see the plugin looking like the attached image.
Good luck with your book.