Added 'application/msexcel' to config/mimes.php for .xls files.
diff --git a/system/application/config/mimes.php b/system/application/config/mimes.php
index 10acfad..438f610 100644
--- a/system/application/config/mimes.php
+++ b/system/application/config/mimes.php
@@ -29,7 +29,7 @@
'smi' => 'application/smil',
'smil' => 'application/smil',
'mif' => 'application/vnd.mif',
- 'xls' => array('application/excel', 'application/vnd.ms-excel'),
+ 'xls' => array('application/excel', 'application/vnd.ms-excel', 'application/msexcel'),
'ppt' => array('application/powerpoint', 'application/vnd.ms-powerpoint'),
'wbxml' => 'application/wbxml',
'wmlc' => 'application/wmlc',