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Mobis compiled with KindleGen can be opened in 7zip because KindleGen includes the zipped source files as part of the conversion process. You will of course not be able to do this with a mobi file that has had the source stripped out.
The hybrid Mobi7/Kindle Format 8 mobis (master mobi) will read correctly on any Kindle reader. Older readers that don't support KF8 will simply display the first part of the file, which contains the legacy Mobi7 format, while KF8 supported readers will know how to locate and display that version of the book.
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