When I do a “Print to file” on my Canon printer, where does the resulting file go and how do I later print it?

I have a Canon PIXMA MP640 printer connected to my Windows XP computer via USB. I’d like to occasionally do a “Print to file” so I could save all the print setup details (mainly the Web page magnification) for later printing. The print driver prompts me for a file name but I don’t know what directory that file goes to nor its file extension. Finally, once I find the print file, how can I print it to my printer? The resulting file is not a PDF file.