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/text_helper.php b/system/helpers/text_helper.php
index cca0939..33d7fa2 100644
--- a/system/helpers/text_helper.php
+++ b/system/helpers/text_helper.php
@@ -366,13 +366,13 @@
 {
 	function convert_accented_characters($str)
 	{
-		if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars'.EXT))
+		if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php'))
 		{
-			include(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars'.EXT);
+			include(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php');
 		}
-		elseif (is_file(APPPATH.'config/foreign_chars'.EXT))
+		elseif (is_file(APPPATH.'config/foreign_chars.php'))
 		{
-			include(APPPATH.'config/foreign_chars'.EXT);
+			include(APPPATH.'config/foreign_chars.php');
 		}
 
 		if ( ! isset($foreign_characters))