Quote:
Originally Posted by aleyda
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unknown book type 'APPLSMMM'
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As Manichean correctly noted, the PRC (Palm ResourCe) file structure is a container format. Its contents can be formated for various uses. Most ebook formats for PalmOS use the other PalmOS container structure, the PDB (Palm DataBase). Mobipocket is the only ebook format that I'm aware of that uses the PRC container and Calibre has no difficulty with these.
The eight character ID, "APPLSMMM", indicates that this file is an application since the first four characters are "APPL". A Google search did find an obscure hit that I couldn't open but its brief quote leads me to think this might be a stock manager application. Perhaps you copied the wrong file for conversion.