Use the SW_XXX constants when calling ShowWindow().

dlls/shlwapi/msgbox.c

@@ -204,15 +204,15 @@ static INT_PTR CALLBACK SHDlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lP
     switch (d->dwType)
     {
     case 0:
-      ShowWindow(GetDlgItem(hDlg, IDCANCEL), FALSE);
+      ShowWindow(GetDlgItem(hDlg, IDCANCEL), SW_HIDE);
       /* FIXME: Move OK button to position of the Cancel button (cosmetic) */
     case 1:
-      ShowWindow(GetDlgItem(hDlg, IDYES), FALSE);
-      ShowWindow(GetDlgItem(hDlg, IDNO), FALSE);
+      ShowWindow(GetDlgItem(hDlg, IDYES), SW_HIDE);
+      ShowWindow(GetDlgItem(hDlg, IDNO), SW_HIDE);
       break;
     default:
-      ShowWindow(GetDlgItem(hDlg, IDOK), FALSE);
-      ShowWindow(GetDlgItem(hDlg, IDCANCEL), FALSE);
+      ShowWindow(GetDlgItem(hDlg, IDOK), SW_HIDE);
+      ShowWindow(GetDlgItem(hDlg, IDCANCEL), SW_HIDE);
       break;
     }
     return TRUE;

dlls/wined3d/device.c

@@ -1250,7 +1250,7 @@ static void WINAPI IWineD3DDeviceImpl_SetupFullscreenWindow(IWineD3DDevice *ifac
     /* Inform the window about the update. */
     SetWindowPos(window, HWND_TOP, 0, 0,
             This->ddraw_width, This->ddraw_height, SWP_FRAMECHANGED);
-    ShowWindow(window, TRUE);
+    ShowWindow(window, SW_NORMAL);
 }
 
 /*****************************************************************************