This can be applied for every game(some games require a serial with right algorithm to work)
1) open cftoolbox and search for your game in second tab
2) right click -> properties, note down the id of game
3) goto start run, there you type (regedit) enter
4) go to this key HKEY_CURRENT_USER\Software\Valve\Steam\User\<your user id>\cd-keys
5) once there, you will see all files (strings to be correct) search for your game id, if it isn't there yet right click --> New --> String (2nd one) and rename it to your game id
6) double click your game id and put in as value anything you want
extra step:
7) if it doesn't work yet, and you've done all above, you may need a valid serial to work, so just google a keygen or serial(watch out for virusses!)
I cant play GTAIV because....
and I havent "User" carpet, (HKEY_CURRENT_USER\Software\Valve\Steam\User\<your user id>\cd-keys)
help me please
pd: I have followed all the previous steps correctly (confirm with cftoolbox 100%valid archives, steam with steamup 2010 and and i note down the id of game, etc...)
edit:
Now this goes out for me:
What do I do with the options that it gives me? wtf? xD sorry... but i noob Thank you in advance