The metallicasteamskin.zip file you have requested: Skins / Steam / Half Life 2 Metallica Steam Skin - 567.97kb 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:
Here is a new Steam skin that adds a Metallica theme to your Steam program. It's fairly well done, although a bit dark.