If you managed to find this file, you already worked out that you need Winrar or something similar, so i wont ask you to go download it.

1) First install optifine. Simply google optifine, and download the most recent version (or the version you're playing on). If the correct version of minecraft isn't found, consult step 2, if Optifine installs correctly, skip to step 3.
2) Create a new profile in the minecraft launcher which matches the version of optifine you downloaded, and launch minecraft in that version.
3) Extract the text files in this folder named "options" and "optionsof" and move them into your .minecraft, note this will wipe any of your own controls, or video settings, but it will make the resourcepack function fully.
4) Move the folder itself into your "resourcepacks" file in the .minecraft directory.