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Extender Provider doesn't support either the IExtenderProvider or the IExtenderProviderUnk interfaces.

The Extender Provider in use does not support the interface you have implemented.

To correct this error

  • Implement IExtenderProvider if the Extendee Object supports the IDispatch automation interface.

    —or—

    Implement IExtenderProviderUnk if the Extendee Object is based on IUnknown.

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