Files in the folder "country_04.rpf" go to:  

GTAV > mods > x64t.rpf > levels > gta5 > _hills > country_04 > country_04.rpf


Files in the folder "cs4_14.rpf" go to:
 
GTAV > mods > x64t.rpf > levels > gta5 > _hills > country_04 > cs4_14.rpf