English: 

1. Downlod OpenIV to open .rpf file 
2. open x64i.rpf go to levels/gta5/_citye/downtown 
3. open dt1_22.rpf.rpf drag file from(to dt1_22.rpf) to OpenIV window 
or you can just Import it 
4. No need to rebuild rpf file 
5. Enjoy the MOD