--- a/newgrf.c	Fri Dec 08 18:56:39 2006 +0000
+++ b/newgrf.c	Fri Dec 08 19:12:43 2006 +0000
@@ -2218,6 +2218,9 @@
 		case 0x92: /* Game mode */
 			return _game_mode;
 
+		case 0x9A: /* Always -1 */
+			return -1;
+
 		case 0x9D: /* TTD Platform, 00=TTDPatch, 01=OpenTTD */
 			return 1;