Description:
------------
i am trying to download a file from my webserver but it did not working and giving error

before this script i connect to the ftp server and it connected.

Reproduce code:
---------------
<?
$local_file = 'c:/aaa.zip';
$server_file = 'www/download/aaa.zip';
if (ftp_get($conn_id, $local_file, $server_file, FTP_BINARY)) {
   echo "Successfully written to $local_file\n";
} else {
   echo "There was a problem\n";
   exit();
}
if ($conn_id) {
   ftp_close($conn_id);
}
?>

Expected result:
----------------
i am trying to download a file naming aaa.zip which is present in 'www/download/aaa.zip' i want to download this file in my local hard drive path c:/aaa.zip

NOTE: I also give this path as this 

$local_file = 'c:\aaa.zip';
$server_file = 'www/download/aaa.zip';

no error show also no file copy in my drive c:
but when i give this address.
$local_file = 'c:/aaa.zip';
$server_file = 'www/download/aaa.zip';
it give error which i write below

Actual result:
--------------
error is::

Warning: ftp_get(): Error opening c:/aaa.zip in /home/comsdev/public_html/ftp2.php on line 27
There was a problem