Removing internal references to the EXT constant.  Additionally, marked the constant as deprecated.  Use ".php" instead. Also adding upgrade notes from 2.0.2 to 2.0.3.
diff --git a/system/helpers/file_helper.php b/system/helpers/file_helper.php
index 4434494..3931667 100644
--- a/system/helpers/file_helper.php
+++ b/system/helpers/file_helper.php
@@ -352,13 +352,13 @@
 
 		if ( ! is_array($mimes))
 		{
-			if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes'.EXT))
+			if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
 			{
-				include(APPPATH.'config/'.ENVIRONMENT.'/mimes'.EXT);
+				include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
 			}
-			elseif (is_file(APPPATH.'config/mimes'.EXT))
+			elseif (is_file(APPPATH.'config/mimes.php'))
 			{
-				include(APPPATH.'config/mimes'.EXT);
+				include(APPPATH.'config/mimes.php');
 			}
 
 			if ( ! is_array($mimes))