Merge the '/apps/' folder in the .rar with the '/apps/' folder on the root of your SD card. Alternatively, place the '/PattView Wii/' folder within the '/apps/' folder on your SD card.
This application will look for 'rvforest.dat' in the root of your SD card. This is the save data for Animal Crossing: City Folk. You can extract this data using one of the many Savegame Managers available to Homebrew users.