Does the error happen or after playing for a while?
The most common cause in 2024-2025. Aggressive antivirus software (especially Windows Defender, McAfee, or Norton) often flags steam_api.dll as a "Potentially Unwanted Program" (PUP) or a "crack" because it hooks into processes. The HD mod's DLL is un-signed, making AVs paranoid. Result: The AV silently deletes or quarantines the file. Steam Api.dll Resident Evil 4 Hd