AutoCAD Inventor :: Capturing Save As Event

I have addin running inside Inventor. The requirement is that addin should be able to capture the "save as" operation done by the user. Internally, addin stores unique information in the active Inventor file and when user does "Save as", it needs to generate and store the new unique information in the newly created file after Save As. That is the reason it is required to capture the Save As event.

It was possible to capture the "Save" event and there I get Event Timing Enum (kBefore and kAfter). But the file name is same for kBefore and kAfter. So its not possible to identify that its Save As operation.