Use modloader or add files in gta3.img.

Check this mod here:
https://www.youtube.com/watch?v=RbAhaYQJVM4

Please subscribe to my YouTube channel for more great mods:
https://www.youtube.com/c/dragomazing?sub_confirmation=1

And here you can download my other mods:
https://www.gtainside.com/user/Dragomazing