'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',