We used to develop software that used the Windows Accessibility APIs (UI Automation). On certain versions of Excel with some files it would crash the client app

We used to develop software that used the Windows Accessibility APIs (UI Automation). On certain versions of Excel with some files it would crash the client application with a null pointer exception once you try to read the window name/class. It would be interesting to see the cause of the crash e.g. a core dump/user-mode dump/event viewer log.