security - How to add a local file to trusted zone in IE8?

I want to add a file on my local drive (C:\something.html) to the Trusted Zone in IE8 (my OS is Windows Server 2003). The Add Sites Dialog box, does not seem to take entries for files on the local drive.

I have tried:

file://C:\something.html
file:\\localhost\c$\something.html

I have seen other solutions (on superuser and elsewhere) such Mark of Web, that allow your local file to be treated as if it were part of the internet zone, but I want to add my file to the Trusted Zone.

How can I do this? Thanks.