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<?php
$file = realpath($_GET["file"]);
$filename = basename($file);
if($file && isset($file) && file_exists($file)) {
	header('Content-Type: application/octet-stream');
	header("Content-Disposition: attachment; filename=$filename");
	header('Content-Length: '.filesize($file));
	readfile($file);
} else {
  echo "No file selected";
}