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What format are these "PRC" files? Perhaps they are a format that Calibre does not support. A "PRC" file is just a "wrapper" - a little like a ZIP file is; the data inside it can be in any format whatsoever. Although, for example, Mobipocket books often have a ".prc" file extension, so do a thousand and one other types of data file, too.
What format are these specfic PRC files that you have?
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