Quote:
Originally Posted by user_none
Then you have gotten very lucky because FC checks for the packaging. For instance, the mimetype file must be at location 30, be uncompressed and contain exactly "application/epub+zip" without the quotes.
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That boils down to storing the mimetype first and uncompressed. If it's already that way, chances are it won't change if you don't touch it. Of course, there could be some program that completely repackages the whole archive for any modification, and that program wouldn't be appropriate. But I would expect most zip programs to be well-behaved in this respect, so doing simple edits should be safe (and if it's not, it's fixable).