What's the correct syntax for linking to an HTML page on your local C: drive from an <A HREF=> tag in a HTML page on your desktop?

I have an HTML page on my desktop that I edit myself that has links to my own sites, as a two column list, with the local copy on my C: drive (that I develop on) on the left side and the online copy (on the public www) on the right side.

With my previous computer running Windoze XP and Internet Exploder, I used to code for the local link: <A HREF=“c:/mysite/index.htm”>My Site</A>

But that no longer works with Windoze 7 and Firefox. Instead, I get an OK box that says, “Firefox doesn’t know how to open this address, because the protocol ( c ) isn’t associated with any program.”

So what do I put in the HREF to make it a link to an HTML page on my local C: drive?

I’d like to use a syntax that’s compatible with both Firefox and Internet Exploder, but I know that’s probably not possible.