Index: branches/RC/core/kernel/utility/email_send.php
===================================================================
diff -u -r9247 -r10098
--- branches/RC/core/kernel/utility/email_send.php	(.../email_send.php)	(revision 9247)
+++ branches/RC/core/kernel/utility/email_send.php	(.../email_send.php)	(revision 10098)
@@ -165,8 +165,8 @@
 		 */
 		function GetFilenameExtension($filename)
 		{
-			$last_dot = strrpos($filename, '.');
-			return $last_dot !== false ? substr($filename, $last_dot + 1) : '';
+			$last_dot = mb_strrpos($filename, '.');
+			return $last_dot !== false ? mb_substr($filename, $last_dot + 1) : '';
 		}
 
 		/**
@@ -878,7 +878,7 @@
 		 */
 		function guessContentType($filename, &$content_type, &$encoding)
 		{
-			$file_extension = strtolower( $this->GetFilenameExtension($filename) );
+			$file_extension = mb_strtolower( $this->GetFilenameExtension($filename) );
 
 			$mapping = '(xls:application/excel)(hqx:application/macbinhex40)(doc,dot,wrd:application/msword)(pdf:application/pdf)
 						(pgp:application/pgp)(ps,eps,ai:application/postscript)(ppt:application/powerpoint)(rtf:application/rtf)
@@ -1698,8 +1698,8 @@
 		 */
 		function ExtractRecipientName($text, $email = '')
 		{
-			$lastspace = strrpos($text, ' ');
-			$name = trim(substr($text, 0, $lastspace - strlen($text)), " \r\n\t\0\x0b\"'");
+			$lastspace = mb_strrpos($text, ' ');
+			$name = trim(mb_substr($text, 0, $lastspace - mb_strlen($text)), " \r\n\t\0\x0b\"'");
 			if (empty($name)) {
 				$name = $email;
 			}