Originally Posted by fiery
2. Open the epub file using 7-zip (or other zip utility). Add the fonts bellow and edit the files directly in the archive through the 7-zip explorer (you may need to change the default editor for .css/.opf/.xhtml files to WordPad for example (I use SciTE)).
Thanks for your guide. You're suggesting editing files through an archive editor. Can you first unzip the epub, make the changes and then compile again? I couldn't find any tool that would make this compilation.