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Unmanaged API Reference (Office Development in Visual Studio)

Starting with the 2007 Microsoft Office system, Office applications use the IManagedAddin Interface interface to call into an add-in loader component that is included with the Visual Studio Tools for Office runtime. This component is used to help load managed add-ins. You can create your own add-in loader component by implementing this interface.

IManagedAddin Interface

A COM interface that you can implement to load and unload managed add-ins in Office applications.