--- mstools/samples/playit/playit.c	2018/08/09 18:20:01	1.1
+++ mstools/samples/playit/playit.c	2018/08/09 18:20:38	1.1.1.2
@@ -1,4 +1,5 @@
 #include <windows.h>
+#include <mmsystem.h>
 #include <string.h>
 #include <stdio.h>
 
@@ -325,7 +326,7 @@ static UINT sndFlags;
 
                 case IDM_ABOUT:
                     lpDlgProc = MakeProcInstance((FARPROC) AboutDlgProc, hInst);
-                    DialogBox(hInst, "AboutBox", hwnd, (WNDPROC)lpDlgProc);
+		    DialogBox(hInst, "AboutBox", hwnd, lpDlgProc);
                     FreeProcInstance(lpDlgProc);
                     break;