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[Luckie]

Zitat:

WS_OVERLAPPED
Creates an overlapped window. An overlapped window has a title bar and a border. Same as the WS_TILED style.

WS_OVERLAPPEDWINDOW
Creates an overlapped window with the WS_OVERLAPPED, WS_CAPTION, WS_SYSMENU, WS_THICKFRAME, WS_MINIMIZEBOX, and WS_MAXIMIZEBOX styles. Same as the WS_TILEDWINDOW style.

Ergo die nötigen Stile einzeln setzen und WS_BORDERR weglassen. BTW fällt auf dass WS_OVERLAPPEDWINDOW den Stil WS_THICKFRAME beinhaltet.