OPEN 
pafile/modules/pa_download.php
FIND
elseif((!empty($mirrors_data) && $mirror_id == -1) || (empty($mirrors_data)))
		{
			//$real_filename = $file_data['real_name'];
			$real_filename = '"'. $file_data['real_name']. '"';
			$physical_filename = $file_data['unique_name'];
			$upload_dir = (!empty($file_data['upload_dir'])) ? $file_data['upload_dir'] : $pafiledb_config['upload_dir'];
			$file_url = $file_data['file_dlurl'];
		}
 
REPLACE WITH
elseif((!empty($mirrors_data) && $mirror_id == -1) || (empty($mirrors_data)))
		{
			$real_filename = $file_data['real_name'];
			$physical_filename = $file_data['unique_name'];
			$upload_dir = (!empty($file_data['upload_dir'])) ? $file_data['upload_dir'] : $pafiledb_config['upload_dir'];
			$file_url = $file_data['file_dlurl'];
		}
 
It is not a bug  
 
It is known error running apache on windows OS