You must replace core animation files to enable Tony Stark's flying and shooting physics.
To get this modification running smoothly without breaking your game files, keep the following parameters in mind: Requirement A clean installation of Grand Theft Auto IV for PC. System RAM
JulioNIB's mod completely strips away the standard crime-simulator gameplay of GTA 4 and turns it into an immersive Iron Man simulator:
⚠️ Modding Disclaimer: Modifying game files can corrupt your game save or cause performance issues on modern operating systems. Always create a manual backup of your GTA IV folder before dropping in script files. Iron Man IV - Installation guide by JulioNIB - GTA iV