changed EXT to always be defined as '.php' to allow the renaming of the index.php file
diff --git a/index.php b/index.php
index bac85d9..d60e79f 100644
--- a/index.php
+++ b/index.php
@@ -85,7 +85,7 @@
 | APPPATH	- The full server path to the "application" folder
 |
 */
-define('EXT', '.'.pathinfo(__FILE__, PATHINFO_EXTENSION));
+define('EXT', '.php');
 define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));
 define('FCPATH', str_replace(SELF, '', __FILE__));
 define('BASEPATH', $system_folder.'/');