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Assembly: Microsoft.Office.Interop.Excel (in microsoft.office.interop.excel.dll)
Required String. The name of the file that contains the add-in you want to add to the list in the add-in manager.
Optional Object. Ignored if the add-in file is on a hard disk. True to copy the add-in to your hard disk if the add-in is on a removable medium (a floppy disk or compact disc). False to have the add-in remain on the removable medium. If this argument is omitted, Microsoft Excel displays a dialog box and asks you to choose.
This method doesn't install the new add-in. You must set the Installed property to install the add-in.