Index: moodle/lib/filelib.php
--- moodle/lib/filelib.php Base (1.188)
+++ moodle/lib/filelib.php Locally Modified (Based On 1.188)
@@ -1171,6 +1171,8 @@
         'odf'  => array ('type'=>'application/vnd.oasis.opendocument.formula', 'icon'=>'odf.gif'),
         'odb'  => array ('type'=>'application/vnd.oasis.opendocument.database', 'icon'=>'odb.gif'),
         'odi'  => array ('type'=>'application/vnd.oasis.opendocument.image', 'icon'=>'odi.gif'),
+        'ogg'  => array ('type'=>'audio/ogg', 'icon'=>'audio.gif'),
+        'ogv'  => array ('type'=>'video/ogg', 'icon'=>'video.gif'),
 
         'pct'  => array ('type'=>'image/pict', 'icon'=>'image.gif'),
         'pdf'  => array ('type'=>'application/pdf', 'icon'=>'pdf.gif'),