copy and past it here :
Grand Theft Auto IV\pc\data\maps\props\vegetation
mode by shahab

for ENB use this settings :
[TREE]
LeavesReflectionAmount=-2.0565
LeavesSpecularPower=97.354
LeavesAmbientAmount=66.27
LeavesColorMultiplier=0.634
LeavesColorPow=0.918
LeavesColorFilterR=1.031
LeavesColorFilterG=1.102
LeavesColorFilterB=1.002

download link :
http://s1.picofile.com/file/7454083866/vegetation.rar.html