Requre authentication when downloading EXE/ZIP files > 128K?

I want to set up our Squid 2.3S1 to require a user name password
authentication if a user tries to download a ZIP or EXE file which has a
size > 128K. Is this possible?

(The reason for the size specification is to still allow EXE CGI scripts to
work.)

Thanks in advance...

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Rod Savard - Delphi Developer
Savard Software - Tri-Cities, Washington, USA
rodney@savard.com - http://www.savard.com