sku.sis Where the csd file probably holds the game as it is the biggest.When I was doing a backup of the same game in steam it actually created the following files On the steamcache the download of Wolfentstein 3d created a folder with the id 2291 which corresponds roughly to the findings on this where the id 2290 is listed. I've tested the steamcache with Wolfenstein 3d which is a rather small game to download so ideal for testing.