The item is too large to open. Restore the item and then open it.
The problem can be worked around by using Internet Explorer.
N\A
This issue has been addressed in the following release:
Enterprise Vault 14.3.1
https://www.veritas.com/content/support/en_US/downloads/update.UPD671016.html
"The item is too large to open. Restore the item and then open it."