Help:Creating mods

Welcome, modders! This page contains useful information for anybody who wants to create mods. If you just want to use other people's mods, see Help:Using mods.

What can currently be modded?

• Textures (can't increase resolution)
• Models (can't increase poly count on Switch)
• Actor parameters, including enemies, weapons and armors
• Adding new actors
• Overworld and dungeon map files (but collision editing is mostly not doable yet)
• Text / dialogue

Getting set up

Dumping the game files

To make mods, you'll need to start by dumping the unedited game files from your copy of BotW.

Setting up tools

Since BotW uses a lot of Nintendo's own file formats, you'll need tools to be able to edit them.

Rules

The RSTB file

The file ResourceSizeTable.product.rsizetable (referred to as the RSTB file) contains a list of size limits for almost every file in the game (calculated from the non-Yaz0-compressed file sizes). If you edit a file to make its filesize bigger, you'll need to edit this file to prevent errors. For details, see Help:Updating the RSTB.

File names and caching

The game assumes that any 2 files with the exact same filename also have the exact same contents. If you don't follow this rule when editing files, the game might load the wrong version of the file, leading to errors. The same rule applies to texture names - all textures should have unique names, even if they're located in different files.