What's the format to install icon packs mentioned in System Settings?

[Alessandro Longo]

Hi,

in System Settings > Icons KCM there is a button to install an icon 
theme from a file. What's the correct format that is intended to be an 
"icon theme"? I tried every archive containing icon pack for Linux 
desktops that I found on the web and it always reply that it isn't the 
correct format. I didn't find this format mentioned in the Web though a 
lot of searches.

Cheers,

-- 
Alessandro Longo