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Old 02-24-2013, 12:04 AM   #5
dgatwood
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Posts: 629
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Join Date: Jan 2012
Device: iPad, iPhone, Nook Simple Touch
The first file in the archive must be the mimetype file. If it isn't, it won't pass validation. Also, that file must be stored uncompressed (in theory, anyway), and the directories themselves must not appear as separate entries, IIRC.

Getting this right usually requires either a command-line tool or an app that knows how to do it. For example, in OS X, you can usually get away with

Code:
cd folder_containing_extraction
zip -Xr9D ../filename.epub mimetype * -x .DS_Store
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