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In the original Mobipocket format the first 31 bytes of the file was used for the file name, typically containing the book title. In more modern books this field contains a unique identifier that starts with the characters "CR!", such as "CR!CCNGNFNTD51FD60RD7BTHNQ4KKXJ". Perhaps the reader software is failing to locate the metadata within the MOBI file and using that information instead.
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