(High score) Why this code does not implement file download

(High score) Why this code does not implement file download
High score Reward:
Why my code doesn't implement file download, I tried it under Linux and Windows. Run to Ob_start () under Windows, and the program is not running anymore.
$root = "D:/wamp/www/panjinli/downloadsouce";
if (Is_dir ($root))
{
$openHandle =opendir ($root);
while (false!== ($file =readdir ($openHandle)))
{
if (!is_dir ($root. $file))
{
echo "". $root. $file. "
";
}
}
Closedir ($openHandle);
}else
{
echo "folder does not exist";
}

$do = (isset ($_request[' do '))? Addslashes ($_request[' do '): ';
if ($do = = ' Down ')
{
$file = (isset ($_request[' file '))? Addslashes ($_request[' file '): ';
$path = (isset ($_request[' path '))? Addslashes ($_request[' path '): ';

Ob_start ();
function DownLoad ($info, $file)
{
Ob_clean ();
if (!file_exists ($info))
{
Exit (' Error: '. __line__ ', '. basename (__file__). '! ');
}

$info =file_get_contents ($info);

Header (' content-transfer-encoding:binary ');
Header (' Content-type:application/force-download; Name= '. $file. ');
Header (' content-disposition:attachment; Filename= '. $file. ');
Header (' cache-control:private ');
Header (' Pragma:no-cache ');
Header (' expires:0 ');
Echo $info;
Die ();
}
DownLoad ($path. $file, $file);
}
?>
Header (' content-disposition:attachment; Filename= '. UrlEncode ($file). ');
DownLoad ($path. $file, $file);

Into
DownLoad ($path. ' /'. $file, $file);

