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Old 10-31-2010, 08:51 PM   #2
wallcraft
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Posts: 6,977
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Join Date: Mar 2006
Location: Mississippi, USA
Device: Kindle 3, Kobo Glo HD
A MOBI file isn't a renamed ZIP file, it is a PRC file (originally designed for a Palm PDA).

An ePub is a ZIP file, renamed .epub, but the first file in the ZIP Container MUST be ‘mimetype’ which holds the MIME type for the ZIP Container (i.e., “application/epub+zip”). The file MUST NOT be compressed nor encrypted and there MUST NOT be an extra field in its ZIP header.
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