To register the type library, click the Register Type Library button on the Type Library Editor toolbar. 

Typically, you do not need to explicitly register a type library because it is registered automatically when you register your COM server application (see Registering a COM object). However, when you create a type library using the Type Library wizard, the type library is not associated with a server object. In this case, you can register the type library directly using the toolbar. 

Registering the type library adds an entry to the Windows registry for the type library.