Nope just cant get it to work.

Are there no instructions for this anywhere ?

Also if you use the admin tool to update the config file it all ways deleted anything in this line:
$config[allowfiles] = "";
Even if you enter it in there manually when you edit config files in admin tools it will display the list but as soon as you click update it returns a blank line into the $config[allowfiles] = ""; line !!!! <img border="0" title="" alt="[Frown]" src="images/icons/frown.gif" />

Regards
Clint