diff --git a/CMakeLists.txt b/CMakeLists.txt
index 103e815..fba1b2e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -222,6 +222,7 @@ target_sources(system3 PRIVATE
   src/sys/nact_sys1.cpp
   src/sys/nact_sys2.cpp
   src/sys/nact_sys3.cpp
+  src/sys/nact_window.cpp
   src/sys/scenario.cpp
   )
 if (ENABLE_DEBUGGER)
diff --git a/src/sys/ags.cpp b/src/sys/ags.cpp
index 663ba47..262b057 100644
--- a/src/sys/ags.cpp
+++ b/src/sys/ags.cpp
@@ -263,77 +263,6 @@ AGS::~AGS()
 	SDL_DestroyTexture(sdlTexture);
 }
 
-void AGS::load(FILEIO* fio)
-{
-	menu.font_size = fio->getw();
-	text.font_size = fio->getw();
-	palette_bank = fio->getw();
-	if (!palette_bank) {
-		palette_bank = -1;
-	}
-	text.font_color = fio->getw();
-	menu.font_color = fio->getw();
-	menu.frame_color = fio->getw();
-	menu.back_color = fio->getw();
-	text.frame_color = fio->getw();
-	text.back_color = fio->getw();
-	for (int i = 0; i < 10; i++) {
-		int sx = fio->getw();
-		int sy = fio->getw();
-		int ex = fio->getw();
-		int ey = fio->getw();
-		bool save = fio->getw() ? true : false;
-		bool frame = fio->getw() ? true : false;
-		menu_w[i].reset(sx, sy, ex, ey, frame, save);
-		fio->getw();
-		fio->getw();
-	}
-	for (int i = 0; i < 10; i++) {
-		int sx = fio->getw();
-		int sy = fio->getw();
-		int ex = fio->getw();
-		int ey = fio->getw();
-		bool save = fio->getw() ? true : false;
-		bool frame = fio->getw() ? true : false;
-		text_w[i].reset(sx, sy, ex, ey, frame, save);
-		fio->getw();
-		fio->getw();
-	}
-}
-
-void AGS::save(FILEIO* fio)
-{
-	fio->putw(menu.font_size);
-	fio->putw(text.font_size);
-	fio->putw(palette_bank == -1 ? 0 : palette_bank);
-	fio->putw(text.font_color);
-	fio->putw(menu.font_color);
-	fio->putw(menu.frame_color);
-	fio->putw(menu.back_color);
-	fio->putw(text.frame_color);
-	fio->putw(text.back_color);
-	for (int i = 0; i < 10; i++) {
-		fio->putw(menu_w[i].sx);
-		fio->putw(menu_w[i].sy);
-		fio->putw(menu_w[i].ex);
-		fio->putw(menu_w[i].ey);
-		fio->putw(menu_w[i].save ? 1 : 0);
-		fio->putw(menu_w[i].frame ? 1 : 0);
-		fio->putw(0);
-		fio->putw(0);
-	}
-	for (int i = 0; i < 10; i++) {
-		fio->putw(text_w[i].sx);
-		fio->putw(text_w[i].sy);
-		fio->putw(text_w[i].ex);
-		fio->putw(text_w[i].ey);
-		fio->putw(text_w[i].save ? 1 : 0);
-		fio->putw(text_w[i].frame ? 1 : 0);
-		fio->putw(0);
-		fio->putw(0);
-	}
-}
-
 void AGS::set_cg_file(const char *file_name)
 {
 	bmp_prefix = NULL;
diff --git a/src/sys/ags.h b/src/sys/ags.h
index d623440..5d6a92c 100644
--- a/src/sys/ags.h
+++ b/src/sys/ags.h
@@ -101,9 +101,6 @@ public:
 	AGS(const Config& config, const GameId& game_id);
 	~AGS();
 
-	void load(FILEIO* fio);
-	void save(FILEIO* fio);
-
 	void update_screen();
 
 	void load_cg(int page, int transparent);
@@ -232,7 +229,6 @@ public:
 	uint8 cursor_color;
 	int cursor_index;
 
-private:
 	// Window (B command)
 	struct Window {
 		int sx;
@@ -248,6 +244,8 @@ private:
 	};
 	Window menu_w[10];
 	Window text_w[10];
+
+private:
 	void init_windows();
 
 	// Box (E and Y7 commands)
diff --git a/src/sys/nact.cpp b/src/sys/nact.cpp
index f9d6a83..9797a13 100644
--- a/src/sys/nact.cpp
+++ b/src/sys/nact.cpp
@@ -546,7 +546,7 @@ bool NACT::load(int index)
 	for (int i = 0; i < 512; i++) {
 		var[i] = fio->getw();
 	}
-	ags->load(fio.get());
+	load_display_state(fio.get());
 	for (int i = 0; i < 10; i++) {
 		tvar[i] = fio->read_string(22);
 	}
@@ -586,7 +586,7 @@ bool NACT::save(int index, const char header[112])
 	for (int i = 0; i < 512; i++) {
 		fio->putw(var[i]);
 	}
-	ags->save(fio.get());
+	save_display_state(fio.get());
 	for (int i = 0; i < 10; i++) {
 		fio->write_string(tvar[i], 22);
 	}
diff --git a/src/sys/nact.h b/src/sys/nact.h
index 5749f8f..a2bf869 100644
--- a/src/sys/nact.h
+++ b/src/sys/nact.h
@@ -32,6 +32,7 @@ class AGS;
 class MAKO;
 class MsgSkip;
 class Encoding;
+class FILEIO;
 
 // special codes for NACT::exit_code
 const int NACT_HALT = -1;
@@ -142,6 +143,8 @@ protected:
 
 	bool load(int index);
 	bool save(int index, const char header[112]);
+	void load_display_state(FILEIO* fio);
+	void save_display_state(FILEIO* fio);
 
 	int menu_select(int num_items);
 	void wait_after_open_menu();
diff --git a/src/sys/nact_window.cpp b/src/sys/nact_window.cpp
new file mode 100644
index 0000000..e7559e6
--- /dev/null
+++ b/src/sys/nact_window.cpp
@@ -0,0 +1,80 @@
+/*
+	ALICE SOFT SYSTEM 3 for Win32
+
+	[ NACT - window ]
+*/
+
+#include "nact.h"
+#include "ags.h"
+#include "fileio.h"
+
+void NACT::load_display_state(FILEIO* fio)
+{
+	ags->menu.font_size = fio->getw();
+	ags->text.font_size = fio->getw();
+	ags->palette_bank = fio->getw();
+	if (!ags->palette_bank) {
+		ags->palette_bank = -1;
+	}
+	ags->text.font_color = fio->getw();
+	ags->menu.font_color = fio->getw();
+	ags->menu.frame_color = fio->getw();
+	ags->menu.back_color = fio->getw();
+	ags->text.frame_color = fio->getw();
+	ags->text.back_color = fio->getw();
+	for (int i = 0; i < 10; i++) {
+		int sx = fio->getw();
+		int sy = fio->getw();
+		int ex = fio->getw();
+		int ey = fio->getw();
+		bool save = fio->getw() ? true : false;
+		bool frame = fio->getw() ? true : false;
+		ags->menu_w[i].reset(sx, sy, ex, ey, frame, save);
+		fio->getw();
+		fio->getw();
+	}
+	for (int i = 0; i < 10; i++) {
+		int sx = fio->getw();
+		int sy = fio->getw();
+		int ex = fio->getw();
+		int ey = fio->getw();
+		bool save = fio->getw() ? true : false;
+		bool frame = fio->getw() ? true : false;
+		ags->text_w[i].reset(sx, sy, ex, ey, frame, save);
+		fio->getw();
+		fio->getw();
+	}
+}
+
+void NACT::save_display_state(FILEIO* fio)
+{
+	fio->putw(ags->menu.font_size);
+	fio->putw(ags->text.font_size);
+	fio->putw(ags->palette_bank == -1 ? 0 : ags->palette_bank);
+	fio->putw(ags->text.font_color);
+	fio->putw(ags->menu.font_color);
+	fio->putw(ags->menu.frame_color);
+	fio->putw(ags->menu.back_color);
+	fio->putw(ags->text.frame_color);
+	fio->putw(ags->text.back_color);
+	for (int i = 0; i < 10; i++) {
+		fio->putw(ags->menu_w[i].sx);
+		fio->putw(ags->menu_w[i].sy);
+		fio->putw(ags->menu_w[i].ex);
+		fio->putw(ags->menu_w[i].ey);
+		fio->putw(ags->menu_w[i].save ? 1 : 0);
+		fio->putw(ags->menu_w[i].frame ? 1 : 0);
+		fio->putw(0);
+		fio->putw(0);
+	}
+	for (int i = 0; i < 10; i++) {
+		fio->putw(ags->text_w[i].sx);
+		fio->putw(ags->text_w[i].sy);
+		fio->putw(ags->text_w[i].ex);
+		fio->putw(ags->text_w[i].ey);
+		fio->putw(ags->text_w[i].save ? 1 : 0);
+		fio->putw(ags->text_w[i].frame ? 1 : 0);
+		fio->putw(0);
+		fio->putw(0);
+	}
+}