I am sure there is a way, but as a novice type of guy myself, I would just use a redirect. Simple and effective.
I would:
delete "index.html"
create a new file called "index.php"
Then, I would put the following lines in the index.php
Code:
<? header("Location: /file location/filename/"); /*Redirect to Filename*/
/* Make sure any code below does not get executed when redirected */
exit;
?>