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Using a Multiple Document Interface

[The feature associated with this page, MCIWnd Window Class, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of MCIWnd Window Class, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Applications that use a multiple document interface (MDI) might need to specify window styles that are not available through the MCIWndCreate function. For these applications, you can register and create an MCIWnd window by using the MCIWndRegisterClass function with the CreateWindowEx function. The MCIWndRegisterClass function registers the MCIWND_WINDOW_CLASS window class and then CreateWindowEx creates an instance of an MCIWnd window.