check out your sourcesdk/bin/source2009/bin/Gameconfig.txt

"Counter-Strike: Source"
{
"GameDir" "c:\program files\steam\steamapps\my_Steam_username\counter-strike source\cstrike"
"hammer"
{
"GameData0" "c:\program files\steam\steamapps\my_Steam_username\sourcesdk\bin\ep1\bin\cstrike.fgd"
"TextureFormat" "5"
"MapFormat" "4"
"DefaultTextureScale" "0.250000"
"DefaultLightmapScale" "16"
"GameExe" "c:\program files\steam\steamapps\my_Steam_username\counter-strike source\hl2.exe"
"DefaultSolidEntity" "func_detail"
"DefaultPointEntity" "info_player_terrorist"
"BSP" "c:\program files\steam\steamapps\my_Steam_username\sourcesdk\bin\source2009\bin\vbsp.exe"
"Vis" "c:\program files\steam\steamapps\my_Steam_username\sourcesdk\bin\source2009\bin\vvis.exe"
"Light" "c:\program files\steam\steamapps\my_Steam_username\sourcesdk\bin\source2009\bin\vrad.exe"
"GameExeDir" "c:\program files\steam\steamapps\my_Steam_username\counter-strike source"
"MapDir" "c:\program files\steam\steamapps\my_Steam_username\sourcesdk_content\cstrike\mapsrc"
"BSPDir" "c:\program files\steam\steamapps\my_Steam_username\counter-strike source\cstrike\maps"
"CordonTexture" "tools\toolsskybox"
"MaterialExcludeCount" "0"
}
}


voila

FuzZz, I want to thank you personally. Because of you, now I can use HL2, HL:E1, HL:E2, and Portal. I have a question though, shouldnt CS:S be on that list for uses with the 2009 Engine?