diff --git a/data/mdl/maxwell.mdl b/data/mdl/maxwell.mdl
deleted file mode 100644
index 6c9d243..0000000
Binary files a/data/mdl/maxwell.mdl and /dev/null differ
diff --git a/data/mdl/tetopear.mdl b/data/mdl/tetopear.gmdl
similarity index 100%
rename from data/mdl/tetopear.mdl
rename to data/mdl/tetopear.gmdl
diff --git a/engine/src/client.c b/engine/src/client.c
index 1bfda76..157ae87 100644
--- a/engine/src/client.c
+++ b/engine/src/client.c
@@ -52,7 +52,7 @@ static void scene(GSClient client) {
 	int	      i;
 	int	      a = 1;
 
-	if(m == NULL) m = GSModelOpen(client->engine, "game:/mdl/tetopear.mdl");
+	if(m == NULL) m = GSModelOpen(client->engine, "game:/mdl/tetopear.gmdl");
 
 	rot[1] = r;
 	for(i = -a; i <= a; i++) {
diff --git a/engine/src/core.c b/engine/src/core.c
index 6a8a583..8776632 100644
--- a/engine/src/core.c
+++ b/engine/src/core.c
@@ -61,8 +61,8 @@ GSEngine GSEngineCreate(GSEngineParam* param) {
 
 	sh_new_strdup(engine->resource);
 
-	GSEngineRegisterResource(engine, "base", "base.pak");
-	GSEngineRegisterResource(engine, "game", "game.pak");
+	GSEngineRegisterResource(engine, "base", "base.gpak");
+	GSEngineRegisterResource(engine, "game", "game.gpak");
 
 	if(engine != NULL && param->client && (engine->client = GSClientCreate(engine)) == NULL) {
 		GSLog(GSLogError, "Failed to create client");
diff --git a/wizard.sh b/wizard.sh
index c937855..2a9ceeb 100755
--- a/wizard.sh
+++ b/wizard.sh
@@ -15,7 +15,7 @@ fi
 
 ls -d ../resource/model/* | while read a; do
 	N=`echo $a | rev | cut -d/ -f1 | rev`
-	$W ./engine/tools/gs_makepak$E ../data/mdl/$N.mdl ../resource/model/$N
+	$W ./engine/tools/gs_makepak$E ../data/mdl/$N.gmdl ../resource/model/$N
 done
-$W ./engine/tools/gs_makepak$E base.pak ../engine/data
-$W ./engine/tools/gs_makepak$E game.pak ../data
+$W ./engine/tools/gs_makepak$E base.gpak ../engine/data
+$W ./engine/tools/gs_makepak$E game.gpak ../data