diff -Naur mate-dialogs-1.8.0-old/src/util.c mate-dialogs-1.8.0/src/util.c
--- mate-dialogs-1.8.0-old/src/util.c	2013-10-31 20:44:13.000000000 +0200
+++ mate-dialogs-1.8.0/src/util.c	2014-03-26 14:10:37.392167648 +0200
@@ -252,7 +252,7 @@
 
   if (tmp) {
     g_free (tmp);
-    g_spawn_command_line_async ("yelp help:matedialog", error);
+    g_spawn_command_line_async ("xdg-open http://mate-desktop.org/", error);
   }
 }