Erik

I think machines without IE installed won't have that mailto key. For example while using Netscape to browse clicking a mailto link fires up a Netscape mail window and not OE which is my default email client. So Netscape may totally internalize mailto without the registry entry. I don't have a machine without IE installed to verify this theory though.

>HKEY_CLASSES_ROOT\mailto\shell\open\command
>
>On my machine this value holds
>
>"C:\PROGRAM FILES\OUTLOOK EXPRESS\MSIMN.EXE" /mailurl:%1"
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>The shell command is what executes when a user clicks a mailto link.