Disabling integrated authentication on single file

Hi,
I'm not entirely sure if this is the right place to ask, but here goes.
I have a website that uses windows integrated authentication. This is great and the way i want it, BUT, i now have a single .aspx file in that site, that i would like anonymous access to.
I am running this on IIS 6 on a windows server 2003.
How do i go about doing this, if i even can do it? web.config, IIS console or do i need to make a new site for this one file alone?
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