Without a patch, the mouse does not move the camera, and it doesn't aim the gun efficiently.
: Search for "Resident Evil 4 MouseAim Fix" by developer KrossX .
If you are playing the modern Steam version, you do not need to add mouse support, but you do need to fix its broken mechanics. The definitive way to do this is by installing , a comprehensive community plugin built into the famous Resident Evil 4 HD Project . Why re4_tweaks is Essential
: Ensure your mod matches your specific game version (2007 original vs. 2014 Ultimate HD). They are not cross-compatible.
Before you download anything, you must identify your game version. Mouse support varies wildly: