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Summary

The RemoveProp API

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/// The RemoveProp function removes an entry from the property list of the specified window. The specified character string identifies the entry to be removed.

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/// <para>The RemoveProp function returns the data handle associated with the string so that the application can free the data associated with the handle.</para>

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/// <para>Windows 95/98/Me:  RemovePropW is supported by the Microsoft Layer for Unicode (MSLU). RemovePropA is also supported to provide more consistent behavior across all Microsoft Windows operating systems. To use this, you must add certain files to your application, as outlined in Microsoft Layer for Unicode on Windows 95/98/Me Systems.</para>

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/// <para>Windows Vista: RemoveProp is subject to the restrictions of User Interface Privilege Isolation (UIPI). A process can only call this function on a window belonging to a process of lesser or equal integrity level. When UIPI blocks property changes, GetLastError will return 5.</para>

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static extern IntPtr RemoveProp(IntPtr hWnd, string lpString);

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Documentation

[RemoveProp] on MSDN

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/// <para>Before a window is destroyed (that is, before it returns from processing the WM_NCDESTROY message), an application must remove all entries it has added to the property list. The application must use the RemoveProp function to remove the entries.</para>