on GFI download security how to prevent download not block !!

hello ..
when i search on your great EE.. i foound GFI DownloadSecurity which supposed to prevent downloads with a predefind conditions .. the problem that the program do not prevent download .. but just block it ... i mean it it download it to your computer but after it completion it decide whenther to free it to ur computer or to block it !
i need the property that enable me to prevent download because i don't want to slow my network speed or slow internet !! .. the secured download is secondary thing ! ..
who can help me ?
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3ezzAsked:
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Tim HolmanCommented:
You can block .EXEs and .ZIPs etc with ISA server, using content groups:

http://www.isaserver.org/tutorials/Understanding_and_Configuring_ISA_content_groups.html

Make sure your default rules are not overriding this.
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Tim HolmanCommented:
If you want to block program downloads, usually best to do this at the gateway and block .EXE and .ZIP files etc with an HTTP policy.
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3ezzAuthor Commented:
how ?
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Tim HolmanCommented:
What firewalls etc have you already got ?
Are you looking to protect just one machine, or others ?
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Tim HolmanCommented:
Most proxy servers will do this - eg Squid, CCProxy ?
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3ezzAuthor Commented:
i have ISA Server .. and my clients have ISA fierwall client ..
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3ezzAuthor Commented:
Squid  ? .. is this a Linux Server ? ..
where i can get info about configuring it ?
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