Fix Easy Anti-Cheat error that says Untrusted system file when launching Steam games like Apex Legends, Elden Ring, Lost Ark, New World, Jump Force, Watch Dog, etc.

When you try to play the game, if Apex Legends crashes on startup with error message Engine Error, Error reading pak file “common.rpak” Error 0x00000017, then ...

On Steam you can do this by right-clicking on Apex Legends, go to “Properties”, “Local Files”, and then click on “Verify integrity of the game files”.