phranque - 7:08 pm on Sep 17, 2012 (gmt 0)
renaming what-is-here.html to index.html
that and a redirect is the correct solution.
what happens when you request urls such as these?
what happens when googlebot requests http://www.example.com/subdirectory/ in a directory that has one of your dummy index.php files?
(it's going to index the content served by the index.php)