I tried this on Linux and it behaved as expected.

In fact I unit tested this for variety of cases when I posted it here based on PrakashK's solution. ;-)

As such the problem probably arises from the fact that the Dos newlines are being converted to "\n" when they are read. Try to binmode() the file handle and run the program again.

    open my $fh, "+<$file" or die "$!";
    binmode $fh;

    ...
[download]

--
John.