URL Field for internal network locations

Hi,

Is it possible to use a URL field to open an internal file on a network location?  I want to be able to use an address like this "file:///C:\Users\Evolution\Documents\ACT" and when I click it, the folder will open.  Is this possible?  I've tested this and the URL goes in and is hyperlinked but nothing happens when you click on the link.

Thanks

Damon