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hWnd2 = CreateWindowExW(0, szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, 100, 100, 500, 500, nullptr, nullptr, hInstance, nullptr);
hRgn = CreateRoundRectRgn(0, 0, 500, 500, 50, 50);
SetWindowRgn(hWnd2, hRgn, FALSE );
CloseHandle(hRgn);
ShowWindow(hWnd2, nCmdShow);
UpdateWindow(hWnd2);