The Resident Evil 4 modding community is massive. Some mods (especially those that change gameplay mechanics or unlock framerates) require replacing steam-api.dll with a modified version. If you have installed mods manually:
Download the latest installer from the official Steam website. Run the installer to refresh all core system DLLs. System Requirements and Compatibility Steam-api.dll Resident Evil 4 Download
: In non-licensed versions, the modified DLL used to bypass Steam DRM may not have been correctly copied into the game directory. How to Fix steam_api.dll Errors in Resident Evil 4 1. Restore from Antivirus Quarantine The Resident Evil 4 modding community is massive