If the game worked before and suddenly stopped, your antivirus likely "cleaned" the file. Check Windows Defender: Windows Security Virus & threat protection Protection history . Look for steam_api.dll and select Add an Exception:
C:\Program Files (x86)\Steam\steamapps\common\Resident Evil 4\Bin32\ steam apidll resident evil 4 hd
The steam_api.dll file is a Dynamic Link Library developed by Valve Corporation. If the game worked before and suddenly stopped,
: Usually means Steam isn't running or the file is corrupted. steam apidll resident evil 4 hd
: A faulty download or incomplete update can result in the file becoming unreadable or missing from the game's directory. Permissions