diff --git a/Makefile b/Makefile
index 871dc26..41a795c 100644
--- a/Makefile
+++ b/Makefile
@@ -23,6 +23,7 @@ OBJS = src/fileio.o \
 	src/sys/nact_crc32.o \
 	src/sys/nact_input.o \
 	src/sys/nact_sys3.o \
+	src/win/nact_dialog.o \
 	src/res3/Script1.o
 
 DEPS := $(OBJS:%.o=%.d)
@@ -34,6 +35,6 @@ src/res3/Script1.o: src/res3/Script1.rc
 	windres $< $@
 
 clean:
-	rm -f src/*.o src/sys/*.o src/res3/*.o system3.exe $(DEPS)
+	rm -f src/*.o src/sys/*.o src/win/*.o src/res3/*.o system3.exe $(DEPS)
 
 -include $(DEPS)
diff --git a/src/sys/dri.cpp b/src/sys/dri.cpp
index 9bd6296..7169b0e 100644
--- a/src/sys/dri.cpp
+++ b/src/sys/dri.cpp
@@ -7,13 +7,6 @@
 #include "dri.h"
 #include "crc32.h"
 #include "../fileio.h"
-#if defined(_SYSTEM1)
-#include "../res1/resource.h"
-#elif defined(_SYSTEM2)
-#include "../res2/resource.h"
-#else
-#include "../res3/resource.h"
-#endif
 
 extern _TCHAR g_root[_MAX_PATH];
 
diff --git a/src/sys/nact.cpp b/src/sys/nact.cpp
index a5b46e2..6d1a5ef 100644
--- a/src/sys/nact.cpp
+++ b/src/sys/nact.cpp
@@ -4,16 +4,7 @@
 	[ NACT ]
 */
 
-#if defined(_SYSTEM1)
-#include "../res1/resource.h"
-#elif defined(_SYSTEM2)
-#include "../res2/resource.h"
-#else
-#include "../res3/resource.h"
-#endif
-
 #include <windows.h>
-#include <windowsx.h>
 #include "nact.h"
 #include "ags.h"
 #include "mako.h"
@@ -480,63 +471,3 @@ void NACT::output_console(char log[])
 	WriteConsole(hConsole, log, strlen(log), &dwWritten, NULL);
 #endif
 }
-
-BOOL CALLBACK NACT::TextDialogProc(HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam)
-{
-	static NACT* nact;
-	char string[64];
-	int pnt, cnt;
-	
-	switch(msg) {
-		case WM_CLOSE:
-			EndDialog(hDlg, IDCANCEL);
-			break;
-		case WM_INITDIALOG:
-			// get this pointer
-			nact = (NACT *)lParam;
-			// init dialog
-			sprintf_s(string, 64, "文字列を入力してください（最大%d文字）", nact->tvar_maxlen);
-			Edit_SetText(GetDlgItem(hDlg, IDC_TEXT), string);
-			Edit_SetText(GetDlgItem(hDlg, IDC_EDITBOX), nact->tvar[nact->tvar_index - 1]);
-			if(nact->tvar[nact->tvar_index - 1][0] == '\0') {
-				EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);
-			} else {
-				EnableWindow(GetDlgItem(hDlg, IDOK), TRUE);
-			}
-			break;
-		
-		case WM_COMMAND:
-			switch(LOWORD(wParam)) {
-				case IDC_EDITBOX:
-					GetDlgItemText(hDlg, IDC_EDITBOX, string, 32);
-					pnt = cnt = 0;
-					while(string[pnt] != '\0') {
-						unsigned char dat = string[pnt];
-						if((0x81 <= dat && dat <= 0x9f) || 0xe0 <= dat) {
-							pnt++;
-						}
-						pnt++;
-						cnt++;
-					}
-					if(cnt == 0 || cnt > nact->tvar_maxlen) {
-						EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);
-					} else {
-						EnableWindow(GetDlgItem(hDlg, IDOK), TRUE);
-					}
-					break;
-				case IDOK:
-					GetDlgItemText(hDlg, IDC_EDITBOX, string, 32);
-					strcpy_s(nact->tvar[nact->tvar_index - 1], 22, string);
-					EndDialog(hDlg, IDOK);
-					break;
-				default:
-					return FALSE;
-			}
-			break;
-		
-		default:
-			return FALSE;
-	}
-	return TRUE;
-}
-
diff --git a/src/sys/nact.h b/src/sys/nact.h
index b123f9b..71e80a8 100644
--- a/src/sys/nact.h
+++ b/src/sys/nact.h
@@ -218,7 +218,7 @@ private:
 	uint32 calc_crc32();
 
 	// Y27 ダイアログ
-	static BOOL CALLBACK TextDialogProc(HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam);
+	void text_dialog();
 
 	// 終了フラグ
 	bool terminate;
diff --git a/src/sys/nact_sys3.cpp b/src/sys/nact_sys3.cpp
index 7577073..95e381c 100644
--- a/src/sys/nact_sys3.cpp
+++ b/src/sys/nact_sys3.cpp
@@ -4,14 +4,6 @@
 	[ NACT - command ]
 */
 
-#if defined(_SYSTEM1)
-#include "../res1/resource.h"
-#elif defined(_SYSTEM2)
-#include "../res2/resource.h"
-#else
-#include "../res3/resource.h"
-#endif
-
 #include "nact.h"
 #include "ags.h"
 #include "mako.h"
@@ -19,7 +11,6 @@
 #include "../fileio.h"
 
 extern _TCHAR g_root[_MAX_PATH];
-extern HINSTANCE g_hinst;
 
 void NACT::cmd_calc()
 {
@@ -1546,8 +1537,7 @@ void NACT::cmd_y()
 			break;
 		case 27:
 			tvar_maxlen = param;
-			// TODO: fix
-			// DialogBoxParam(g_hinst, MAKEINTRESOURCE(IDD_DIALOG1), g_hwnd, TextDialogProc, (LPARAM)this);
+			text_dialog();
 			break;
 		case 28:
 			ags->text_space = (param == 0) ? 2 : 0;
diff --git a/src/win/nact_dialog.cpp b/src/win/nact_dialog.cpp
new file mode 100644
index 0000000..8cb658e
--- /dev/null
+++ b/src/win/nact_dialog.cpp
@@ -0,0 +1,80 @@
+#include "nact.h"
+#include <windows.h>
+#include <windowsx.h>
+#include "SDL_syswm.h"
+#if defined(_SYSTEM1)
+#include "../res1/resource.h"
+#elif defined(_SYSTEM2)
+#include "../res2/resource.h"
+#else
+#include "../res3/resource.h"
+#endif
+
+extern SDL_Window* g_window;
+extern HINSTANCE g_hinst;
+
+static BOOL CALLBACK TextDialogProc(HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+	static NACT* nact;
+	char string[64];
+	int pnt, cnt;
+	
+	switch(msg) {
+		case WM_CLOSE:
+			EndDialog(hDlg, IDCANCEL);
+			break;
+		case WM_INITDIALOG:
+			// get this pointer
+			nact = (NACT *)lParam;
+			// init dialog
+			sprintf_s(string, 64, "文字列を入力してください（最大%d文字）", nact->tvar_maxlen);
+			Edit_SetText(GetDlgItem(hDlg, IDC_TEXT), string);
+			Edit_SetText(GetDlgItem(hDlg, IDC_EDITBOX), nact->tvar[nact->tvar_index - 1]);
+			if(nact->tvar[nact->tvar_index - 1][0] == '\0') {
+				EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);
+			} else {
+				EnableWindow(GetDlgItem(hDlg, IDOK), TRUE);
+			}
+			break;
+		
+		case WM_COMMAND:
+			switch(LOWORD(wParam)) {
+				case IDC_EDITBOX:
+					GetDlgItemText(hDlg, IDC_EDITBOX, string, 32);
+					pnt = cnt = 0;
+					while(string[pnt] != '\0') {
+						unsigned char dat = string[pnt];
+						if((0x81 <= dat && dat <= 0x9f) || 0xe0 <= dat) {
+							pnt++;
+						}
+						pnt++;
+						cnt++;
+					}
+					if(cnt == 0 || cnt > nact->tvar_maxlen) {
+						EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);
+					} else {
+						EnableWindow(GetDlgItem(hDlg, IDOK), TRUE);
+					}
+					break;
+				case IDOK:
+					GetDlgItemText(hDlg, IDC_EDITBOX, string, 32);
+					strcpy_s(nact->tvar[nact->tvar_index - 1], 22, string);
+					EndDialog(hDlg, IDOK);
+					break;
+				default:
+					return FALSE;
+			}
+			break;
+		
+		default:
+			return FALSE;
+	}
+	return TRUE;
+}
+
+void NACT::text_dialog()
+{
+	SDL_SysWMinfo info;
+	SDL_GetWindowWMInfo(g_window, &info);
+	int r = DialogBoxParam(g_hinst, MAKEINTRESOURCE(IDD_DIALOG1), info.info.win.window, TextDialogProc, (LPARAM)this);
+}