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System RPL Files
Description
RPL files are system libraries, utility libraries and drivers that are used by the Wii U's OS and applications/software. They are similar to .dll files on Windows. The system rpl files are located inside a separate storage chip inside the Wii U called: SLC.
Dumping
Using Ftpiiu
Ftpiiu is a program that hosts a FTP server from a Wii U. It allows an external PC to upload, copy and delete files from the proprietary filesystem on Wii U remotely. Additional software may be required to use FTP server features on a PC.
The system RPLs files are located in this path inside a Wii U:
storage_slc/sys/title/00050010/1000400a/code
You can find other copies of those files in separate folders in the Wii U SLC, but they are just backups or old versions of the system that my not be compatible with all software titles.
Using a Nand dump
The alternative, and more complicated, method is to use nanddumper to dump the SLC nand and then decrypt and extract the files from it via wfs-extract.
Loading
Cemu normally emulates the system RPLs in high level.
To force Cemu to load a system rpl file instead of emulating it, place the file directly in a folder named cafeLibs inside your Cemu folder. Do not copy all the .rpl files because many of them will cause Cemu to crash.
Make sure "Load Shared Libraries" is set in the game profile. Some older profiles erroneously disabled these, and the disabled state carries over to the custom profile file.
Tested files
These below are the files tested and known to work. Other files probably will just lead to games crashing on boot.
| filename | usage | size in bytes | cemu version |
|---|---|---|---|
drmapp.rpl |
Digital rights management. Checks if the app that is being launched it legit in the Wii U Menu (Title data required) | 603,968 | ? |
erreula.rpl |
Error System Applet (Title data required) | 790,080 | ? |
nn_ec.rpl |
Nintendo Network E-Commerce library | 176,128 | ? |
nn_fp.rpl |
Friend list service library. | 21,824 | 2.0-57+ |
nn_olv.rpl |
Olive (Miiverse) library (Title data required). | 131,072 | ? |
nn_sl.rpl |
Title management for Wii U Menu | 403,904 | ? |
nsyskbd.rpl |
Keyboard driver for software keyboard | 20,416 | ? |
snd_user.rpl |
Extended sound effects for Sound driver | 84,032 | 1.11.5+ |
snduser2.rpl |
Updated extended sound effects for Sound driver | 111,360 | 1.11.5+ |
swkbd.rpl |
Software keyboard (Title data required) | 1,116,288 | ? |
- The keyboard files make name entry work in Pokkén Tournament.
- Monster Hunter 3 Tri G(JP) requires
snd_user.rpl,swkbd.rpl,nsyskbd.rplandnn_sl.rplto boot - The
swkbd.rplbeing present will crash Cemu if the corresponding Title files for the Software Keyboard are not present in mlc01\sys\title\0005001b\1004F000 - The
erreula.rplbeing present will crash Cemu if the corresponding Title files for the ErrEula are not present in mlc01\sys\title\0005001b\10051000 - The
nn_ec.rplis required to successfully start Lego Dimensions whenerreula.rplis present.nn_ec.rplmay have compatibility issues in a small amount of games that use it, such as Minecraft: Wii U Edition in online mode. - The
drmapp.rplandnn_sl.rplsystem libraries allows Cemu to title switch from the Wii U Menu. - The
nn_olv.rpllibrary fixes a crash in the Miiverse applet, as well as allowing a connection to the Miiverse servers in games that use it, however this just results in an error code since the service is discontinued.nn_olv.rplmay have compatibility issues in a small amount of software. This library is broken in offline mode. If the proper files are not pressent in the MLC folder then this library will not work correctly.