HTML and Mobi even txt would be better in my opinion to
use converlit to convert them to html or ABC amber LIT converter to convert them to 14 different kind of formats.
You can convert html to mobi with mobigen.exe
But... who am i to judge :smoking: , you can use ABC Amber LIT
https://wiki.mobileread.com/wiki/E-book_conversion to convert LIT to PDF.
(a good page for all kinds of converter tools
)