Upload .doc files

Try this one:

Code:

'docx'  =>  array('application/vnd.openxmlformats-officedocument.wordprocessingml.document','application/octet-stream','application/x-zip-compressed'),

or this ones

'doc'   =>  'application/msword',
'docx'  =>  array('application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip'),
'xlsx'  =>  array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip'),
'word'  =>  array('application/msword', 'application/octet-stream'),