Content
Just like most software, Breath of the Wild requires non-executable content files to work correctly. They are stored in the title content directory on Wii U and in the romfs on Switch.
To minimise loading times, files that are frequently loaded together or at the same time are packed into SARC archives. Because of this optimisation, a significant amount of game files are located within archives. Some files may also be present in more than a single archive with the same resource path.
Directories
Actor
This directory is found in the unpacked content files, Bootup.pack, TitleBG.pack, actor packs, event packs, and dungeon packs.
Its canonical resource path is "Actor".
In the add-on content, it is found in dungeon packs.
The Actor directory contains files defining the actor objects that populate the game world (e.g. enemies, buildings, NPCs). It also includes configuration files for the actor and AI system.
Effect
This directory is found in the unpacked content files, Bootup.pack, TitleBG.pack and event packs.
Its canonical resource path is "Effect".
Event
This directory is found in the unpacked content files, Bootup.pack and TitleBG.pack.
Its canonical resource path is "Event".
Event contains event packs, information about events and configuration files for the event manager.
Font
This directory is found in the unpacked content files.
Its canonical resource path is "Font".
Game
This directory is found in the unpacked content files.
Its canonical resource path is "Game".
Layout
This directory is found in the unpacked content files, Title.pack and Bootup.pack.
Its canonical resource path is "Layout".
Layout contains UI layout archive files. These are used to store UI files (layouts, animations and images). Their file extension is blarc.
Local
This directory is found in in the unpacked content files (Wii U version only).
Its canonical resource path is "Local".
Local appears to be a development remnant. It is unused in release versions and is not present at all on Switch.
Map
This directory is found in the unpacked content files, Bootup.pack and TitleBG.pack.
Its canonical resource path is "Map/".
If the DLC is installed, this directory can be found in the unpacked content files, AocMainField.pack, dungeon packs, and shrine packs in the add-on content directory. Its canonical path is "Aoc/0010/Map/".
The Map directory contains files that define the game's overworld and dungeon layout.
Model
This directory is found in the unpacked content files, TitleBG.pack and event packs.
Its canonical resource path is "Model".
In the add-on content, it is found in dungeon packs (see Content/Pack).
Movie
This directory is found in the unpacked content files.
Its canonical resource path is "Movie".
In the add-on content, it is found in _.
The Movie directory contains video files for prerendered cutscenes or demos.
This directory is found in the unpacked content files.
Its canonical resource path is "NavMesh".
Pack
This directory is found in the unpacked content files.
Its canonical resource path is "Pack".
In the add-on content, it is found in _.
Pack contains SARC archives with the .pack extension. Essential packs like TitleBG and Bootup are stored there.
Physics
Physics contains configuration files and Havok binary packfiles for the Havok physics engine.
Sound
This directory is found in the unpacked content files, Bootup.pack, TitleBG.pack and event packs.
Its canonical resource path is "Sound".
In the add-on content, it is found in _.
System
Terrain
UI
This directory is found in the unpacked content files and Bootup.pack.
Its canonical resource path is "UI".
UI mostly contains images (memory and compendium pictures, item images, map tiles) and UI map information.
Voice
This directory is found in the unpacked content files.
Its canonical resource path is "Voice".
In the add-on content, it is found in _.