Remember to close steam before you start to edit the file. Ok first off you need to get Ultraedit (search for it on Google). After you install it, open gcache.gcf, it will take a while depending on your computer. After it opens go to search and type /media/movies it should bring you to the string that needs to be edited. Highlight the G in G-man, and start typing this in
Kleiners_lab.exe"}"2", after you typed that in exit the program, it should ask you if you want to save click yes. This should take a while also so be patient. Now open steam and go to open the movies section. It should only have G-man in it. Check to see if you are downloading anything. If you are it worked, now just wait and when it's finished open it up with steam and you get the kleiners lab part.
Kleiners_lab.exe"}"2", after you typed that in exit the program, it should ask you if you want to save click yes. This should take a while also so be patient. Now open steam and go to open the movies section. It should only have G-man in it. Check to see if you are downloading anything. If you are it worked, now just wait and when it's finished open it up with steam and you get the kleiners lab part.