As Steam releases updates to its client, the API version also evolves. A very old version of the game that hasn't been updated might have an outdated steam_api.dll that is no longer fully compatible with your current Steam client, leading to crashes or launch failures.

Files may have been lost during a Steam update or game installation.

Navigate to the game's installation folder (usually C:\Program Files (x86)\Steam\steamapps\common\GRID Autosport ).