Liblist.gam

game			"string"
icon			"string"
developer		"string"
developer_url		"string"
manual			"string"
gamedll		"string"
gamedll_linux		"string"
gamedll_osx		"string"
secure			"<boolean>"
svonly			"<boolean>"
cldll			"<boolean>"
type			"..."
startmap		"<map>"
trainmap		"<map>"
mpentity		"<ent>"
mpfilter               "string"
fallback_dir		"..."
fallback_maps		"..."
nomodels		"<boolean>"
nohimodels		"<boolean>"
detailed_textures	"<boolean>"

game

The string specified under game appears as the title for the window when the mod is running; it is also used in My Games List.

icon

Relative path to 16x16 24 bit .tga file.

gamedll

This keyvalue refers to the game DLL file relative to the mod's root folder. Path separators should be \.

gamedll_linux

This keyvalue refers to the game SO file relative to the mod's root folder. Path separators should be /.

gamedll_osx

This keyvalue refers to the game DYLIB file relative to the mod's root folder. Path separators should be /.

secure

Allow VAC secure server.

svonly

Is this a server only mod?

type

This keyvalue is either singleplayer_only, multiplayer_only, or omitted.

mpentity

This keyvalue is WON only. Use mpfilter instead.

mpfilter

Do not show maps with names containing this string in Create Server dialogue.

fallback_dir

This keyvalue specifies a mod directory (i.e. cstrike, NS, etc...) for the filesystem to mount. This will only mount mods installed to steamapps\half-life\ and Half-Life itself.

fallback_maps

Todo: Find out how this one works...