Kindly refer the following technote links which will be helpful to you.
Title:-- What causes Backup Exec to report a file as a corrupt file?
http://seer.support.veritas.com/docs/233646.htm
And,
Title:- What is the intended use of the Open File Option and the Advanced Open File Option?
http://seer.support.veritas.com/docs/263784.htm
We hope this helps.