FaithfulBetterGUIs.zip is a release file of the Minecraft resource pack Faithful And BetterGUIs, made for Minecraft 1.12.2. It was published on June 25, 2018 and is 6.1 MB in size. For the full description, screenshots and every other version, visit the Faithful And BetterGUIs resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.