[eluser]Computerzworld[/eluser]
thanks a lot... it really helped me and now I am able to upload the file with .do extension.
here is what I have did in order to upload this kind of file in mimes.php
Code:
'do' => array('application/octet-stream','text/plain')
Mozilla treats .do file's mime type as 'application/octet-stream' and IE treats it as 'text/plain'...