When responding to the WM_RENDERFORMAT and WM_RENDERALLFORMATS messages, the
clipboard owner must not call OpenClipboard before calling SetClipboardData.
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WM_RENDERALLFORMATS Notification ��ע��
When responding to a WM_RENDERALLFORMATS message, the clipboard owner must
call the OpenClipboard and EmptyClipboard functions before calling
SetClipboardData.
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