--- /usr/share/pear/Horde/Data/Vcard.php.ORI	2020-04-15 18:26:54.281537622 +0200
+++ /usr/share/pear/Horde/Data/Vcard.php	2021-03-25 00:28:55.359705577 +0100
@@ -21,6 +21,12 @@
  * @package   Data
  */
 class Horde_Data_Vcard extends Horde_Data_Imc {
+    /**
+     * MIME content type.
+     *
+     * @var string
+     */
+    protected $_contentType = 'text/vcard';
 
     /**
      * Exports vcalendar data as a string. Unlike vEvent, vCard data
@@ -42,5 +48,16 @@
 
         return $s;
     }
+    
+    public function exportFile($filename, $data)
+    {
+        if (!isset($this->_browser)) {
+            throw new LogicException('Missing browser parameter.');
+        }
+
+        $export = $this->exportData($data);
+        $this->_browser->downloadHeaders($filename, 'text/vcard', false, strlen($export));
+        echo $export;
+    }
 
 }