Quote:
Originally Posted by tsgreer
Oh I didn't know that, thank you for the clarification. My ereader files on my mac have .pdb extension. All of the .prc files on my computer seem to be mobipocket, so I'll try to be more specific. 
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PDB and PRC are both just "wrappers" around any type of data. The contents of the file are determined by an 8-character field in the file header. In the case of a MobiPocket file this is either "TEXTREAD" or "BOOKMOBI". You'll see this if you open a Mobi file in a text viewer such as Notepad.