F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 9.00 Administrator's Manual - page 140
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This setting works only with Microsoft Exchange
Server 2007 and 2010.
Scan timeout
Specify how long to wait for the real-time scan
result. After the specified time, the client that
tries to access the scanned message gets the
"virus scanning in progress" notificaion.
File Type Recognition
Intelligent file type
recognition
Select whether you want to use Intelligent File
Type Recognition or not.
Trojans and other malicious code can disguise
themselves with filename extensions which are
usually considered safe to use. Intelligent File
Type Recognition can recognize the real file type
of the message attachment and use that while
the attachment is processed.
Using Intelligent File Type Recognition
strengthens the security, but can degrade the
system performance.