In addition to gta3.img add mods.img for mods. As well as Dmagic wheel for the correct operation of the wheels on new cars. + instructions for installing mods.
Features: Installing mods without replacing files
Note: This mod-patch was made before the "Mod Loader", but today it can serve as an alternative. After all, "IMG for mods" is independent of gta-vc.exe
When installed, it affects (lines) default.dat, default.ide, gta-vc.dat
Instead of replacing in these files, add to these: gta3.img>mods.img defeult.ide>mods.ide
Weaknesses: You cannot add cutscenes and player models.
P.S. I did it a long time ago, and today I would only touch one default.dat file. But since lost the source of the installer, too lazy to do it again.