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PRC is, in fact, not an ebook format, but merely a container for data that is supposed to go onto Palm devices. It looks like the actual book data inside that container is not in a format supported by Calibre.
You could explain in a little more detail, though, what you mean by "when i start calibre to look what is in the file"- Do you mean you tried to add the file to your Calibre library and got that error message, or did you add the file to the library and got the error message when you tried to open the file in the ebook viewer or convert it?
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