Find by API the local file name of new file in discarded change set

Hello to the forum members,

I'm interested in the following scenario:
1) Create a change-set with new file in it.
2) Discard the change-set.

I'd like to find the local file name of the discarded file. I follow the events being listened by EventManager. I see that event IChangeHistoryEvent is being called with the type IChangeHistoryEvent.DISCARD_CHANGE_SETS. However, the versionable I receive does not have a state ID, so trying to get its local path using ICopyFileArea fails.

I'll be grateful for suggestions how to get the file name of the deleted file.

Thanks,
Gidi