File Upload and allowed type

[eluser]satie[/eluser]
Hello,

I know that there's a problem with the library Upload.php in ./system/libraries/
so I change the code using this guide:
http://ellislab.com/forums/viewthread/204725/

But now CI sends me this error:

Severity: Warning

Message: getimagesize(): open_basedir restriction in effect. File(C:\Windows\Temp\phpBDD8.tmp) is not within the allowed path(s): (d:\inetpub\vhosts\task.netplanet.it\httpdocs\)

Filename: libraries/Upload.php

Line Number: 609

with this configuration in my controller:

Code:

$config['allowed_types'] = 'gif|jpg|png';

But if I use:

Code:

$config['allowed_types'] = '*';

There is no problem.
I would like to avoid to upload all types.

Thanks