You are right. Below is the dos2unix equivalent works on Windows

#!/usr/bin/perl -w

use strict;
use File::Temp qw(tempfile);
use File::Copy;

dos_to_unix($ARGV[1]);

sub dos_to_unix {
    my($file) = @_;

    my($dst, $src);
    my (undef, $tmpfile) = tempfile();

    copy($file, $tmpfile)
      or die "Can't copy $file to $tmpfile due to: $!\n";
    open($dst, ">$file")
      or die "Can't open $file for write due to: $!\n";
    open($src, "<$tmpfile")
      or die "Can't open $tmpfile for read due to: $!\n";

    binmode($dst);
    while(<$src>) {
        chomp;
        print $dst "$_\n";
    }

    close($dst);
    close($src);
}
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