Breast working set up for Half-Life 2: Episode One
By Ghost129er.
Open up Source SDK.
Change Engine Version to: Source Engine 2009
Go to Utilities
Click Edit Game Configurations
Add (Type): Half-Life 2: Episode One
Make directory to: steamsteamapps"username"half-life 2 episode oneepisodic
Mine: h:program files (x86)steamsteamappshohohomihalf-life 2 episode oneepisodic
Click ok.
Close, re-open source SDK.
Hammer the mouse click on Hammer Editor.
Hammer stuff:
(Ps I dont know about you, but you might need to change stuff in hammer, just maps location, other than that, it work!!! :D)
Enjoy.