If the verification step does not work, check your antivirus software’s quarantine log. If steamapi.dll was removed, restore it and add the entire Tomb Raider installation folder to the antivirus’s exclusion list to prevent future false positives.
If you are searching for you are likely facing a frustrating launch error. It is a common issue for PC gamers: you try to launch Tomb Raider (2013) , and instead of the main menu, you are greeted by a system error message stating that "steam_api.dll" is missing or "steam_api.dll was not found." tomb raider 2013 steamapidll download verified