CorelDRAW file won't open.

CorelDRAW question: I am running version 24, recently I was working on a large document(24 pages) when the program abruptly shut down. Now when I try and open it I get an I/O error, I have tried changing the file name with no luck, I am trying to avoid re-creating the whole document. I can share the file if anyone would like to assist. I have tried using previous versions with no luck and also tried opening it in Adobe Acrobat, but that would not work as well. Any suggestions?
Thx, Bob Pearson: