UI contains files used by the game's HUD and GUI.
sbmaptex map textures
These files are for the overworld. They are grouped by map square, with each map square having a varying number of files.
sbreviewtex files for cutscene events
sbstftex images for the game credits
sbitemico inventory icons
Contains the sheikah slate's memory location photographs, and one unused extra. They are 54x480 JPG images on both Wii U and Switch.
Contains the default compendium photos, used when buying from Symin. They are 280x280 JPG images on both Wii U and Switch.