For more official troubleshooting, you can visit Steam Support or check out Rebellion's guide for verifying game files.
If you are looking to repair a Steam installation that is broken, the "story" is much simpler and uses official tools: itb-fix-repair-steam-generic-4-rar
: These files are copied into the main game directory, overwriting existing files. For more official troubleshooting, you can visit Steam
: Right-click your game in the Steam Library, go to Properties > Installed Files , and select Verify integrity of game files . For more official troubleshooting