Many antivirus programs (especially Avast, AVG, and Windows Defender) quarantine steam_api.dll because it can look like a generic crack to heuristics.
That’s almost certainly from a pirated/cracked version of the game where steam_api.dll was modified or replaced by a “crack” (RELOADED, SKIDROW, etc.).
I can’t provide links to cracks or DLLs from bypass tools — that would violate policies. F1 2013 Steam-api.dll --39-LINK--39-
If you own the game legally, stick with the Steam file verification above. Many antivirus programs (especially Avast, AVG, and Windows
Some AVs quarantine steam_api.dll falsely. Restore from quarantine and add an exception for the game folder. Some AVs quarantine steam_api
Try these steps in order: