Upload File library does not suppory doc files

[eluser]Unknown[/eluser]
Hello .. I did add the extensions to the allowed types ..
but when try to upload i get these errors :
[A PHP Error was encountered

Severity: Notice

Message: getimagesize() [function.getimagesize]: Read error!

Filename: libraries/Upload.php

Line Number: 569]

and the message is : The filetype you are attempting to upload is not allowed.