By overriding the ExHeader, modders can allow more code to be added or more RAM to be used. The exheader.bin overrides the game’s ExHeader, which specifies information like codeset info and system mode. This will likely be improved in the future. Please do not use too many patches at the same time. It is important to note that currently patches require loading the entire file into the RAM. bps is found at the same directory within romfs_ext, the base game file will be patched with it. Similarly, if a file with the same name but with extension. stub is found at the same directory within romfs_ext. This allows modders to delete files within the RomFS if a file of the same name but the extension. The RomFS Extension directory contains patches and stubs for RomFS files. The dumped directory will be opened after the dump was completed, and can be found at dump/romfs/ in the User Directory. To dump a game’s RomFS, right-click on the game and select Dump RomFS. It is much easier to get started with a RomFS mod than an ExeFS mod. It is important to note that for this to work properly, the directory structure of the game has to be mirrored in this directory. If this directory is not empty, Citra will combine the contents of it with the base game with files from this directory taking precedence over the base. These types of mods typically alter a game’s textures, text, fonts, sounds, or other graphical assets. The RomFS directory contains replacements for the game’s assets and general files. Note: For compatiblity with Luma3DS, you can also put these ExeFS replacements/patches directly in the mods folder instead of the exefs subfolder. More details on the BPS format can be found on byuu. To use a BPS patch, put a file named code.bps in the ExeFS directory.

More details on the IPS format can be found on ZeroSoft and SMWiki. To use an IPS patch, put a file named code.ips in the ExeFS directory. To use a replacement file for the game code, put a file named code.bin in the ExeFS directory.

These types of mods typically alter game behavior or logic.Ĭurrently you can put a replacement file, or apply two types of patches: IPS and BPS. The ExeFS directory contains replacements or patches for the game’s executable. It is possible that a mod contains only some of these files. Note that everything demonstrated above is optional. The following is an example of a mod in Citra.Įach title has its own Mods directory that can be opened by right-clicking on the game in Citra (alternatively load/mods/ in the User Directory) load/mods/ Citra has a powerful modding framework allowing for multiple formats of patches and flexibility in distribution.

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