Go to the information page in Windchill for 4223456. Navigate to the Content tab, and view the Attachments table. Is there anything listed there?
Else, if nothing is listed there, then is 4223456 an assembly? And 023A_34M is a component maybe? I think these are actually publish files. If so, then I think they will also be deleted along with the actual EPMDocument. I've never done it, so can't say for sure, but seems like that would be the case.