Switch-ptchtxt-mods 'link'

These replace game assets – textures, models, audio, UI text. They live in the /atmosphere/contents/<TitleID>/romfs/ folder. They are safe and easy to install but cannot change game logic (e.g., make an item never deplete or unlock framerate).

A .pchtxt file is just a plain text file, but it has a strict structure. Open any mod like "BotW 60 FPS" and you will see something like this: switch-ptchtxt-mods