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Within the mobipocket file specification there is a special definition of dictionaries so that you can use a mobipocket dictionary on every device with a mobipocket reader software (so your friend could use her Gen3 mobipocket dictionary on a Kindle or on a PC, too).
Epub doesn't have such a definition so every vendor has to implement his own dictionary management into his firmware for himself. So, if you would be able to extract your Sony Reader dictionary you would not be able to use it on your Nook, too, or give it your friend for her Gen3, although they all read epub files.
And until now Bookeen hasn't provided any dictionary support for their epub firmware.
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