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Programming With the Mac OS 8.5 Window Manager
Associates a file with a window.
pascal OSStatus SetWindowProxyAlias (
Your application should call the SetWindowProxyAlias function to establish a proxy icon for a given window. The creator code and file type of the file associated with a window determine the proxy icon that is displayed for the window.
Because the SetWindowProxyAlias function won't work without a saved file, you must establish the initial proxy icon for a new, untitled window with the function SetWindowProxyCreatorAndType , which requires that you know the file type and creator code for the file, but does not require that the file have been saved.
See Supporting Window Proxy Icons for examples of how your application can provide proxy icon support in its document windows.
The function SetWindowProxyFSSpec .