Hello,
As mentioned in the earlier replies, you can see all the installed options on the backup exec media servers from , Help -- About backup exec -- License information
Regarding Advanced open file option, refer the following technote:
Basic Backup Exec Advanced Open File Option (AOFO) information
http://support.veritas.com/docs/275975
To confirm if AOFO is installe don teh remote server
look for vsp.sys on the remote server in WINDOWS/sytem32/drivers directory
NOTE : If we do not receive your reply within two business days, this post would be marked assumed answered and would be moved to answered questions pool