How do I scan large files for viruses?

[#1]

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To configure antivirus scanning of large files (HTTP, FTP, POP3, IMAP, AND SMTP)

1. Connect to the CLI.
2. Enter the following for a FortiGate unit running FortiOS 2.8:
   
   config antivirus service <service_str>
   set memfilesizelimit <MB_integer>
   set port <port_integer>
   set uncompsizelimit <MB_integer>
end

   Enter the following for a FortiGate unit running FortiOS 3.0:

   config antivirus service <service_str>
   set port <port_integer>
   set uncompsizelimit <MB_integer>
end