--- np2/win9xc/dialog/d_sound.cpp	2005/03/20 08:58:20	1.6
+++ np2/win9xc/dialog/d_sound.cpp	2011/02/15 00:51:51	1.7
@@ -933,7 +933,11 @@ void dialog_sndopt(HWND hWnd) {
 	PROPSHEETHEADER	psh;
 	HPROPSHEETPAGE	hpsp[6];										// ver0.29
 
-	hinst = (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE);
+#if defined(_WIN64)
+	hinst = reinterpret_cast<HINSTANCE>(::GetWindowLongPtr(hWnd, GWLP_HINSTANCE));
+#else
+	hinst = reinterpret_cast<HINSTANCE>(::GetWindowLong(hWnd, GWL_HINSTANCE));
+#endif
 
 	ZeroMemory(&psp, sizeof(psp));
 	psp.dwSize = sizeof(PROPSHEETPAGE);