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Old 08-27-2013, 07:01 AM   #9
kovidgoyal
creator of calibre
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Location: Mumbai, India
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If you open it in the calibre viewer, the titlebar will show you [KF8] which means that the file is either a joint file or a pure KF8 file with a .mobi extension (the latter is almost never seen), so it is likely a joint file.
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