This is something you would need to setup in your operating system to allow you to view the system files. If you open a folder on your computer and then go to the Tools and then to the Folder Options you should see a View tab. Go to that tab and scroll down to the selection that say something similar to:
Hide Protected Operating System Files (Recommended)
Uncheck that option and you should then be able to see it and edit it and manipulate it.
You may need to play with how to get to these options if you're not on windows XP as that's what I'm on and not sure how to get there on vista or 7.
You can also edit this file very easily within the Coffeecup DirectFTP program which has a slick little html/text file editor and does open that file for editing both local and server side.