Please consult the help website of your chosen antivirus for information on how to add a program to your exceptions list. Some antivirus programs are known to block programs from running. This should remove any potentially corrupt or broken files and allow the game to run. In some cases, running Steam itself in Administrator mode may resolve the issue: Once you have done this, restart Steam and try launching the game again.
Go to Properties then the Local Files tab.Right click the game in your Steam Library.To resolve this issue, please try the troubleshooting steps below: Run the game as Administrator The error 'Failed to start game (unknown error)' is a Steam error.
