diff -p -up dia-0.97.1/app/commands.c.help dia-0.97.1/app/commands.c
--- dia-0.97.1/app/commands.c.help	2009-11-07 18:13:53.000000000 +0100
+++ dia-0.97.1/app/commands.c	2010-01-25 10:21:02.000000000 +0100
@@ -673,7 +673,7 @@ help_manual_callback (GtkAction *action)
       }
 #else
       helpindex = g_strconcat(helpdir, G_DIR_SEPARATOR_S, dentry,
-			      G_DIR_SEPARATOR_S "index.html", NULL);
+			      G_DIR_SEPARATOR_S "dia.xml", NULL);
 #endif
       bestscore = score;
     }
@@ -689,7 +689,7 @@ help_manual_callback (GtkAction *action)
 # define SW_SHOWNORMAL 1
   ShellExecuteA (0, "open", helpindex, NULL, helpdir, SW_SHOWNORMAL);
 #else
-  command = getenv("BROWSER");
+  command = "yelp";
   command = g_strdup_printf("%s 'file://%s' &", command ? command : "xdg-open", helpindex);
   system(command);
   g_free(command);
diff -p -up dia-0.97.1/lib/dia_dirs.c.help dia-0.97.1/lib/dia_dirs.c
--- dia-0.97.1/lib/dia_dirs.c.help	2009-11-07 18:13:53.000000000 +0100
+++ dia-0.97.1/lib/dia_dirs.c	2010-01-25 10:19:26.000000000 +0100
@@ -63,7 +63,10 @@ dia_get_data_directory(const gchar* subd
   if (strlen (subdir) == 0)		
     return g_strconcat (DATADIR, NULL);
   else
-    return g_strconcat (DATADIR, G_DIR_SEPARATOR_S, subdir, NULL);
+    if (!g_ascii_strcasecmp(subdir, "help"))
+      return  g_strdup("/usr/share/gnome/help/dia");
+    else
+      return g_strconcat (DATADIR, G_DIR_SEPARATOR_S, subdir, NULL);
 #endif
 }