For a bit of context, please refer to this thread first: https://tf2maps.net/threads/hammer-isnt-working.38313/#post-452492 So I got new computer recently, and whenever I tried to launch hammer, I got the error: "gameinfo.txt is missing". So after after a bit of trouble shooting, I figured out that I had to manually go into the "GameConfig.txt" and change all instances of C:/ drive to D/: drive. After that hammer worked fine. The problem is that whenever I tried to launch the hammer editor in Half life 2 option instead tf2, I got the same error despite the fact that I had changed the directory's for both games. Error: D:\Steam\Steamapps\Common\Team fortress 2\Hl2\Gameinfo.txt is missing. As always, any help would be greatly appreciated.