Possibly unrelated, but while you set your output to binmode, you didn't do the same for your input. Also, reading a binary file a "line" at a time makes no sense. Change 
my $data='';
while (<$file>) {
     $data .= $_;
    }

[download]
to 
binmode($file);
my $data;
{ local $/; $data = <$file>; }

[download]

In reply to Re: Remove Extra bytes at end of file by ikegami
in thread Remove Extra bytes at end of file by slloyd

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