I agree that this is probably caused by MobiPocket's proprietary compression scheme, which isn't supported by FBReader because MobiPocket has never released details of how to decompress such files.
This may just be an oversight on Bookeen's part, since the manual is actually a good sales tool and Linux and Mac owners are prime potential customers for the Cybook. They just need to regenerate the file with non-proprietary compression. I have posted a comment on Bookeen's blog.
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