Module export doesn't work correctly - v6.4

In many cases exporting module (by module manager) doesn't work because wrong file size calculation my fix => at line 32 into vtlib/Vtiger/Zip.php (class Vtiger_Zip) I replaced

$zipfilesize = $disk_file_size + ($disk_file_size % 1024);

with

$zipfilesize = $disk_file_size;