From: 
Half-Life: Base Defense
// Valve Game Info file
// These are key/value pairs. Certain mods will use different settings.
//
game "Base Defense"
url_info "http://www.moddb.com/mods/b-def"
mpfilter "info_player_start"
gamedll "dlls/server.dll"
gamedll_linux "dlls/server.so"
secure "0"
type "multiplayer_only"
cldll "1"
hlversion "1111"
icon "game"
edicts "2048"
crcclientdll "1"