It's more a question of setting things up correctly.
the error says : "nie można odnaleźć określonego pliku" : "The specified file could not be found"
Where is your Forged Alliance Install and is it a Steam install? was Forged Alliance run once from steam?
did you tell FAF where to find Forged Alliance?
the path seems to be wrong. you need to point to the entire "Supreme Commander Forged Alliance" directory. not the exe, or bin.
Do like he does in this video :
https://www.youtube.com/watch?v=zCL8rOYqS5E
open the forged alliance folder from steam and click on the path to select it then Ctlr-C to copy it, then go back to FAF settings and Ctrl-V paste it in.
