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>>5389
It's probably directory or custom web server that generates index when path is "/" or "/index". It can be also treating files without extension as HTML/PHP/Perl files.
In pure HTML, you can do it by creating directory named "index" and placing index.html there. In /index.html you have to do redirection to that file.
But there's no reason to do it. Just use index.html, in many cases it won't even show in address bar.
Changing whole directory structure and creating problems with index for being "more with times" is stupid. Hiding file extension isn't any reason, too.
You can just point links to "/" instead of "/index.html"