Called when a managed add-in is loaded.
A manifest is a file (typically, an XML file) that provides information that is used to help load the add-in. For example, a manifest can specify the location of the add-in assembly and the entry point class to instantiate when the add-in is loaded.
The bstrManifestURL parameter contains the value of the Manifest entry under the HKEY_CURRENT_USER\Software\Microsoft\Office\<application name>\Addins\<add-in ID> registry key for the add-in. For more information, see IManagedAddin Interface.
Implement the IManagedAddin::Load method to perform tasks such as configuring the application domain and security policy for the add-in that is being loaded.