This wont be much help though discussing a problem often spawns new solutions.
Do you mean that the data is present as a .pub file or a .doc file?
I (of little brain) never succeeded in doing anything useful with Corel Ventura, but a publishing program of recent vintage might (just) succeed where Ventura 5 fails.
If your data is a doc file, then you have a big problem if it wont open in Word.
Have you tried the facility in Word to "recover any recognisable text"?
Good luck anyway.