why my downloaded file is alwayes damaged or corrupted?

why my downloaded file is alwayes damaged or corrupted?

This is my code
<html>
<form action='../biopydb/new.php' method='post'>
<?php

$Pathway_Name = $_COOKIE['pathwayname'];
$dir1    ="../biopydb/Pathway_Images/"."$Pathway_Name/";

$dirPath = dir($dir1);
$imgArray = array();
while (($file = $dirPath->read()) !== false)
{
  if ((substr($file, -3)=="gif") || (substr($file, -3)=="jpg") || (substr($file, -3)=="png"))
  {
     $imgArray[ ] = trim($file);
  }
}

sort($imgArray);
$c = count($imgArray);
for($i=0; $i<$c; $i++)
{
$value = "$dir1"."$imgArray[$i]";
echo "<input type='radio' name='group1'  value='$value' /> $imgArray[$i] <br/>";

}
?>
<br/><br/>
<center>
<input type='submit' value='Download'/></center>
</form>
</html>

new.php
<?php
$Pathway_Name = $_COOKIE['pathwayname'];
$dir1    ="../biopydb/Pathway_Images/"."$Pathway_Name/";

$filename = $_POST["group1"];

echo"$filename";

header("Content-Disposition: attachment; filename=\"" . basename($filename) . "\"");
header("Content-Type: application/force-download");
header("Content-Length: " . filesize($filename));
header("Connection: close");
?>
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