diff --git a/gamedata/core.games.txt b/gamedata/core.games.txt
index 2d91a614..0f80739d 100644
--- a/gamedata/core.games.txt
+++ b/gamedata/core.games.txt
@@ -112,6 +112,7 @@
 	{
 		"Keys"
 		{
+			"GameExtension"			"game.tf2"
 			"RadioMenuTimeout"		"4"
 		}
 	}