The error message "steam_api.dll was not found" for Tomb Raider (2013)
Tomb Raider (2013) is a single-player action-adventure game originally released by Square Enix and developed by Crystal Dynamics. If you’re seeing references to downloading a “new steam_api.dll” for this game, read the guidance below.
Method 1: Verify Game Files on Steam
This is the official method to replace missing or corrupted game files directly from Steam's servers. Open your Steam Library. Right-click on Tomb Raider. Select Properties. Go to the Installed Files (or Local Files) tab.