Most of books in Internet have sprung from the most famous FIDO-echo BOOK. According to the requirements of the time when e-books have just appeared, all of them were plain text (DOS CP866) with line breaks. Since then technologies have made a big step forward.
Nowadays most of the users preferto read e-books with suitable font and division to chapters and usually they are in HTML format. HTML is standard format for many devices, like PDA and smartphones.
Besides, it can be easily converted to any other format (for instance, iSilo pdb, which can be read on the most of mobile platforms).
Exactly for such converting this software was created. Just by double click, you can do full converting of the book to convenient format with division into chapters and parts, and with ready table of contents.