but the extension was .PRN

Oh, I forgot about that. Yeah, Windows names it .PRN because Windows only knows that it's formatted for a printer; Windows isn't smart enough to know that this particular printer is a very faithful implementation of the PostScript standard. (The people who wrote the driver knew that, but the code that picks the default filename doesn't come from the driver.) You can just change the extension to .ps by renaming the file.

$;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/
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