Originally Posted by Starson17
I don't want two files when one will do. I like to be able to add bookmarks and share with others and not have to worry about a second file. If you don't like the way Calibre's viewer works, why not use another EPUB viewer?
I agree with you, only to the extent that the person with whom you want to share the epub with also wants to know the page where you last stopped at. Most of the time, I suspect it's rather inconvenient for the other person, don't you think?
The only useful situation would be when you're using the same file on different computers, and you want to keep that bookmark.
If the viewer should modify the source file, it should make a duplicate of the source file and only modify the duplicate one.