***************
*** 50,55 ****
  }
  
  /**
   * Preprocess xml output template.
   */
  function template_preprocess_views_bonus_export_xml(&$vars) {
--- 50,63 ----
  }
  
  /**
+  * Preprocess xls output template.
+  */
+ function template_preprocess_views_bonus_export_xls(&$vars) {
+   drupal_set_header('Content-Type: application/msexcel');
+   _views_bonus_export_shared_preprocess($vars);
+ }
+ 
+ /**
   * Preprocess xml output template.
   */
  function template_preprocess_views_bonus_export_xml(&$vars) {