Ah, i was thinking to have different files alltogeter. It seams eavy to have an "all as one" file.
Though the concept is interesting for pdf's, to have one file per screen size.
Then you can have some selection like sound track or subtitles on dvd's.
I see one problem there, that is to stay where you are in the book when changing versions.
Thinking of it, it's annoying that when you pay an e-book, you have one format, rather than all of them.
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