Hi everyone, and thank you for all your answers
@Sirtel : I'm sorry to read this, but if there's no other solution, I will have to do so
@DNSB : yes, the book is referred to as an epub 3 with fixed layout. If I edit the e-book with Calibre and look at the xhtml files, they look pretty fine (if I zoom out by scrolling with my mouse). I didn't know such e-book format would be a problem
What apps would you recommend the most for Windows and Android? I don't mind changing if this provides new possibilities.
The best option would be to download a Kobo ereader and convert my epub to kepub format? I've seen that Calibre could do it. Is there a better option?
@Quoth : I'm actually trying to export as a docx document just to see the outcome