The dark_guard_skins.zip file you have requested: Skins / Player / Skin Packs / Dark Guards - 1.27mb is not available. Perhaps try browsing all files for the game Soldier of Fortune II and upload any files you want to share or are missing. This is the only information we could locate:
Here's a cool skinpack who will replace all the Promethius guards in the game. They look now a bit tougher :p If you're tired of the old skins, go give this file a try. The skins look very nice and I'm sure you will like it.