Getting Started - ArthurHeitmann/F-SERVO GitHub Wiki

Download & Installation

  1. Download latest version from the releases
  2. Extract to some folder
  3. Run F-SERVO.exe

Extracting game files

The game files are inside .cpk files in your [Nier installation]\data folder. You have to extract them once, but don't have to repack them. To see what is in all the files, take a look here.

There are several options for unpacking cpk files. You can either use F-SERVO directly or CriPakTools or Nier CLI. Short description + instructions:


Built in, no additional downloads needed. Drag & drop a file into F-SERVO and select where you want to extract it.

Nier CLI

Nier CLI doesn't have an UI, but requires less steps. To extract cpk files, select all cpk files and drag & drop them onto the nier_cli.exe. This will extract them into the same folder. You have to move the new extracted folders to a different folder (important).


CriPakTools has a GUI, but can only extract one .cpk file at a time. To do so, open CriPakGUI.exe, open a cpk with File > Open CPK and then Extract Files.

Basic Usage & Layout


Opening files

There are 3 ways in which you can open files:

  1. Drag & drop into the left sidebar. This will add it to the File Explorer.
  2. In the File Explorer click on the folder icon in the tool bar. Will have the same result as 1.
  3. Drag & drop into the center main area. This will (when possible) directly open the file, without adding it to the sidebar.


Left sidebar

File Explorer

List of open files. Selecting some files will show editable properties in the bottom panel. Right clicking files gives you all sorts of special actions.


Allows you to search for text through many files or lookup some special IDs. More information here.

Center area - open files

Open files will be added here as tabs. Through the right click menu you can move files to a side view, reload, open in windows explorer and more.
Unsaved files will have a circle icon on the right side.


Title bar


In the title bar you have Undo/Redo (works about 90% of the time :) ), Save All Files, Settings and Auto Translate Toggle.

Right Sidebar

The right sidebar is primarily only used when editing XML script files. It shows a list of all actions in the file (click to jump to them), and details on the current selection.
If you don't need the sidebar you can resize or close it by clicking on the Details tab.



Before starting to open and edit files you should first go through the settings.

Most important settings

Data export path

Set this to your [Game installation]\data folder. When saving DAT files or files inside them this will automatically save them to the right folder, so that you don't have to manually copy files around.

Prefer opening some files in VS Code

If you have VS Code installed you should enable this. The text editor in F-SERVO is very basic :).

Indexing Paths

Here you should add folders of your extracted game files. I'd recommend to only add the data002/012/100.cpk folders to reduce the indexing time.
Indexing is recommended for editing XML files, since they use many ID based references. The indexing process will find all IDs in all files so that you can quickly jump to them.

Need for music & sound modding

WAI extract Directory

When opening the data/sound/WwiseSteamInfo.wai all audio files will be extracted to that folder.

Wwise CLI Path

Here you should select the installation folder of Wwise 2014. This is needed for converting WAV files to WEM (the games audio format).

You can download Wwise here. If you don't want to create an account you can use bugmenot. The web installer is bugged and probably won't work. Instead download and install from the Offline Setup for Windows section Wwise Authoring (64-bit) and Wwise Authoring Data. Here's my private backup of the installers in case the above links should break, link.
The default installation path should be C:\Program Files (x86)\Audiokinetic\Wwise v2014.1.6 build 5318\