The generic function com-object-initialize
is called by the built-in class standard-i-unknown at the point where the first COM interface pointer is made for the object. Prior to this, the object is known only to Lisp and is not involved in any COM operations. The built-in primary method specializing on standard-i-unknown does nothing.
(defmethod com-object-initialize :after
((my-doc doc-impl))
(ensure-open-document-file my-doc))
LispWorks COM/Automation User Guide and Reference Manual - 23 Mar 2017