When calling the SetWindowPos function to change the window Z-order with an insert_after parameter as a real window handle, the expected result is that the insert_after window appears above the specified window hwnd. For example, calling SetWindowPos(g_hwndB, g_hwndA, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW | SWP_NOACTIVATE) should result in window A appearing above window B. Below is a demo showing test results on Windows versus Wine: The initial z-order of WindowA and WindowB is: WindowB is above WindowA: {width=781 height=399} Next, click the "Place WindowA above WindowB" button on Windows and Wine respectively. The test results are as follows: On Windows, After clicking the button, WindowA is placed above WindowB: {width=801 height=439} \ On wine, After clicking the button, the Z-order of WindowA and WindowB remains unchanged: {width=900 height=444} demo： [demo.cpp](/uploads/6e3a44e8b223e54d28c2d65e66856d40/demo.cpp) Signed-off-by: Zhao Yi zhaoyi@uniontech.com -- https://gitlab.winehq.org/wine/wine/-/merge_requests/9999