From Valve Developer Community
From: Claustrophobia
"GameInfo"
{
game "Claustrophobia"
title "Claustrophobia"
"icon" "claustrophobia"
"developer" "Sean Wood"
type singleplayer_only
FileSystem
{
SteamAppId 218 // GCF for Episode 2
ToolsAppId 211
AdditionalContentId 420
SearchPaths
{
Game |gameinfo_path|.
Game |all_source_engine_paths|ep2
Game |all_source_engine_paths|episodic
Game |all_source_engine_paths|hl2
}
}
}