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The method to deactivate the right-click feature in Windows with C++ is to intercept and handle the WM_CONTEXTMENU message. This message is sent to a window when the user right-clicks within the client area of the window.

To deactivate the right-click feature, you can simply ignore this message by returning zero from your window procedure. Here is an example of how to do this:

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        // Handle the WM_CONTEXTMENU message
        case WM_CONTEXTMENU:
            // Ignore the message by returning zero
            return 0;

        // Handle other messages as needed
        // ...

        default:
            // Call the default window procedure for other messages
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
}

In this example, we intercept the WM_CONTEXTMENU message and simply return zero to ignore it. The default window procedure is called for all other messages.

Note that this method only deactivates the right-click feature for a specific window. If you want to deactivate it for the entire system, you'll need to use a different approach.