The trick here is to call binmode() on the filehandle: 
open(BINARYFILE, ">file") or die "can't open file for writing: $!";
binmode(BINARYFILE);

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In reply to Re: printing chr(10) to a file adds chr(13) infront by BrentDax
in thread printing chr(10) to a file adds chr(13) infront by FixNEthing

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