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Old 11-27-2009, 07:34 PM   #4
user_none
Sigil & calibre developer
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In this case PRC and MOBI are the same format just different extensions. Within the file there is a section for metadata. This section is optional. Often older MOBI files, which have the extension PRC, do not have this section. If it is not present the only way to add it is to take a part the file and rebuild it. This is what happens when you convert the file to MOBI. Calibre creates MOBI files with the optional metadata section.
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