The hl2sloth.zip file you have requested: Skins / Steam / HL2 Steam Skin by SlotH - 421.22kb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
This is a very nice Steam skin, made by SlotH. Check out the screenshot, and download if you like.