I understand you're looking for a guide or paper on getting to work with Resident Evil 4 HD (the Ultimate HD Edition on Steam).
If you must replace the file manually, avoid random "DLL downloader" sites as they often contain malware. steam apidll resident evil 4 hd work
When you're trying to dive back into the classic horror of Resident Evil 4 HD and get slapped with a steam_api.dll I understand you're looking for a guide or