In my circumstances the solution above solved the problem and Steam automatically downloaded the file that had previously failed, as you can see in the screenshot below.

Once the file validating as occurred, selected ‘Close’.

Under the ‘Local Files’ tab select ‘Verify Integrity of Game Files…’.

Open the Steam application and from your game library, right click on the problematic game and select ‘Properties’.

Warning: Before trying out the simple instructions below, I strongly suggest you backup any important data on the hard drive where you install Steam games just in case there is a problem with the hard drive.

Instead I downloaded a 12.2MB file and then was able to play the game! I’m glad I didn’t uninstall and try to download the whole game again. My first reaction was that I had a corrupt hard drive or that I had to download the whole game again. When I went to play the game via Steam the above error message displayed. I had just downloaded Company of Heroes 2 via Steam, which is a massive amount of data. This blog post is about how to fix the Steam error “The file or directory is corrupted and unreadable.” (0x570)

Error code 3 company of heroes 2