[eluser]InsiteFX[/eluser]
Try these...
Office 2007 mime types!
Apache .htaccess file add:
AddType application/vnd.openxmlformats .docx .pptx .xlsx
CodeIgniter mime types add: ( ./application/config/mimes.php
Code:
'docx' => 'application/vnd.openxmlformats', // Word
'pptx' => 'application/vnd.openxmlformats', // Power Point
'xlsx' => 'application/vnd.openxmlformats', // Excel