Index: base/applications/mplay32/mplay32.c
===================================================================
--- base/applications/mplay32/mplay32.c	(revision 62092)
+++ base/applications/mplay32/mplay32.c	(working copy)
@@ -102,6 +102,18 @@
 }
 
 static VOID
+ShowLastWin32Error(HWND hwnd)
+{
+    DWORD dwError;
+    LPTSTR lpMessageBuffer;
+    
+    dwError= GetLastError();
+    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, dwError, 0, (LPWSTR)&lpMessageBuffer, 0, NULL);
+    MessageBox(hwnd, lpMessageBuffer, szAppTitle, MB_OK | MB_ICONERROR);
+    LocalFree(lpMessageBuffer);
+}
+
+static VOID
 ShowMCIError(HWND hwnd, DWORD dwError)
 {
     TCHAR szErrorMessage[256];
@@ -138,7 +150,7 @@
                                NULL);
     if (!hTrackBar)
     {
-        MessageBox(hwnd, _T("TrackBar it is not created!"), NULL, MB_OK);
+        ShowLastWin32Error(hwnd);
         return;
     }
 
@@ -158,7 +170,7 @@
                               NULL);
     if (!hToolBar)
     {
-        MessageBox(hwnd, _T("ToolBar it is not created!"), NULL, MB_OK);
+        ShowLastWin32Error(hwnd);
         return;
     }
 
@@ -743,7 +755,11 @@
     WndClass.hbrBackground     = (HBRUSH)(COLOR_BTNFACE + 1);
     WndClass.lpszMenuName      = MAKEINTRESOURCE(IDR_MAINMENU);
 
-    RegisterClassEx(&WndClass);
+    if (!RegisterClassEx(&WndClass))
+    {
+        ShowLastWin32Error(0);
+        return 0;
+    }
 
     hwnd = CreateWindow(szClassName,
                         szAppTitle,
@@ -757,6 +773,12 @@
                         hInstance,
                         NULL);
 
+    if (!hwnd)
+    {
+        ShowLastWin32Error(0);
+        return 0;
+    }
+
     DragAcceptFiles(hwnd, TRUE);
 
     DisableMenuItems();
@@ -780,5 +802,5 @@
         DispatchMessage(&msg);
     }
 
-    return 0;
+    return (int) msg.wParam;
 }