Thank you for your work on this useful plugin!
Some of my ebooks primarily store their contents in “.htm” files instead of “.html” files, and so the check on line 2734 of enf_main.py for
name.endswith("html") causes these files to be missed during processing.
It is relatively simple for me to change this myself, or to modify my ebooks and rename the files therein. However, I wanted to report this here in case you decide it is important enough to include in an update.
Thank you again for the plugin.