I believe whether or not game mods are 'publically downloadable' is set by the game's Steam workshop configuration (i.e. My guess would be that the downloader doesn't work for games that require Steam in order to launch, but that's just a guess. The page claims that it works for 'any Steam game that supports public downloads', and the message I got for the Skyrim mod was 'This file can't be publicly downloaded from the Steam Servers.' I don't really know how the whole thing works or what exactly the difference is between public downloads and whatever Skyrim does. I tried using it to get a Skyrim mod, and it didn't work. It appears you're correct that it doesn't work for every game. Praetorian815: Well, I do know that it works for Shadowrun.
