filedownloading is making the file to view instead of download in drupal7
Read Force Files to Download Instead of Showing Up in the Browser as the page suggests you can achieve this by adding these lines to  .htaccess file 

&lt;FilesMatch "\.(?i:doc|odf|pdf|rtf|txt)$"&gt;
  Header set Content-Disposition attachment
&lt;/FilesMatch&gt;


Or alter mime type