On windows, you should get crlf endings by default:

open FH, ">tmp.txt" or die "Acck: $!";
# binmode FH;
print FH "This has a cr-lf\n";
close FH;
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line-feeds get translated to cr-lf when the text gets printed (and the reverse occurs when you are reading from a text file). If you don't want the cr, uncomment the binmode line.