Hey firba, I downloaded your icons and they say that it contains no icons? Eg, I try change my default L4D icon to yours, after selecting your icon from the browse menu, a popup tells me that this file contains no icons.
Other icons work fine .. is it a problem from my side or ?
I'm not totally sure what you are asking, but this is how you install regular .ico icons. Just put the .ico file(s) somewhere (doesn't matter where) and then right click on a shortcut and then click "Properties." Then click on the button that says "Change Icon," and browse to the icon that you want to use for that shortcut and click "OK" a few times. Then the shortcut's icon should be the new one.