Thanks again for your help. I'm using OS X, and I thought I could just change the extension by clicking twice on the name of the file, and then getting rid of the ending after the '.' and then typing 'tpz'. Yeah, and I noticed that calibre changes it back to .prc when I add the file to the library. SO, I need to figure out how to change the file so that calibre thinks it's tpz. Okay, thanks for your help.
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