James D:

Dooes anyone here know what to do with a .prn file?

Depends on the printer driver that was used to create the file. If you
used a postscript driver then you could print the file on any postscript
compatible printer, you could also create a PDF file from it. If you used
a driver with a proprietary language (e.g. PCL) then you could only print
the file on a PCL capable printer, you could not create a PDF file from
it.

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Mac Cool