Dear Anne,
Thanks very much for your suggestion. That would make sense, wouldn't
it? Unfortunately, it doesn't help, also because Firefox is already
the default browser. But I think I know what does it. I have a nasty
piece of Javascript on all my html pages. I stripped it from one page
and it opened without a problem from Excel. Want to see it? He

<SCRIPT TYPE="text/javascript"
if(window.top == window){
var page = new String(self.document.location.pathname);
var contents = "/index.html?" + page;
top.location.replace(contents);
}
</SCRIPT

It ensures that the right pages are loaded when clicked on in a search
result list.
Thanks anyway for your input, Anne!

Rutger