Thanks for your feedback! At the moment, DVDFab BookFab does not support converting DMM Books formats (.dmmb, .dmme, .dmmr). The team has noted your request, and it may be considered for future versions.
For now, there isn’t a workaround within BookFab itself, but you can keep an eye on updates or submit your request via the Feedback option in the BookFab menu to increase priority.
