The combine_hands.zip file you have requested: Skins / Hands and Gloves / Half-Life 2: Combine Soldier Hands Skin - 115.99kb 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:
For more information on Half-Life 2, visit Halflife2.filefront.com These are very nicely done Combine hands skins for Half-life 2. They should work in most source based mods.