Assembly: Microsoft.Office.Interop.Word (in microsoft.office.interop.word.dll)
The AddIn object is a member of the AddIns collection. The AddIns collection contains all the add-ins available to Microsoft Word, regardless of whether or not they're currently loaded. The AddIns collection includes global templates or Word add-in libraries (WLLs) displayed in the Templates and Add-ins dialog box (Tools menu).
Use AddIns(index), where index is the add-in name or index number, to return a single AddIn object. You must exactly match the spelling (but not necessarily the capitalization) of the name, as it's shown in the Templates and Add-Ins dialog box.
The index number represents the position of the add-in in the list of add-ins in the Templates and Add-ins dialog box.
Use the Add method to add an add-in to the list of available add-ins and (optionally) install it using the Install argument.
To install an add-in shown in the list of available add-ins, use the Installed property.
Use the Compiled property to determine whether an AddIn object is a template or a WLL.