Erik,
I think it's IE that creates the mailto target in the registry. A while back someone that used Netscape said they didn't have that key in the registry. I don't have an IE free system that I can verify this.
>This just tells me that Netscape does not check the Shell settings when following a mailto link, and not necessarily that the "extension" isn't supported on systems with Netscape installed.
>
>One more reason for me to hate Netscape... :-)