UnrealExporter

A batch file exporter for Unreal Engine games using CUE4Parse. Great for automating UE datamining, just specify the files you want and don't want, and speed up your exports by only exporting what's changed.

This project can be used as-is or as a reference, since CUE4Parse documentation is incomplete. Heavily references the source code of FModel for CUE4Parse usage.

Features

• Multiple game support (via multiple config objects or multiple config files)
• Regex paths for bulk exporting
• Path exclusions to avoid crashing
• Patch .pak reconciliation (courtesy of MCMrARM)
• Checkpoint support (only export new/changed files!)
• Parallel-processing files
• Apply mapping files
• CLI args support (point to config files; no support for passing individual keys/values)
• Log file (errors, which files were skipped, which files were outputted, config settings, etc.)
• Automatic AES key finding
• Automatic binary releases (GitHub actions)

Supported file types

When listing an export file path, specify the desired output type at the end, such as :json.

• uasset (as json, png)
• umap (as json)
• locres (as json)
• js (as js)
• db (as db)
• everything else

Usage

Tip

If you know how to use git and the terminal, I recommend cloning the repo instead of downloading a release so that you can quickly get the latest updates with git pull.

Easy setup (download and run)

1. Download latest release
2. Configure config.json (see Config Options below)
3. Run UnrealExporter.exe

Manual setup (recommended)

1. Download and install .NET SDK 8.0
2. Clone the repo, i.e. git clone https://github.com/whotookzakum/UnrealExporter
3. Configure config.json (see Config Options below)
4. Open terminal and execute dotnet run

If you wish to build the project as a executable binary, use the following command:

dotnet publish -c Release --self-contained true -p:PublishSingleFile=true -p:DebugType=None -p:DebugSymbols=false

Config Options

Configure the config.json file in the /configs folder based on the game(s) you wish to export from.

Tip

You can add multiple objects to export from different games, or different files from the same game. For different games, I recommend using multiple configs so you don't have to edit the same config file when you want to change games.

Example config files can be found in /configs/examples. The excluded paths in the example configs are a non-exhaustive list of game files that are known to crash CUE4Parse.

Key	Type	Description
gameTitle	string	Title of the UE game. Can be any arbitrary string that will work as a file name (not allowed: \ / : * ? " | < >). Used for checkpoint naming, matching mapping files, and for your own recordkeeping.
version	string	Unreal Engine version. UE versions supported by CUE4Parse. Accepts strings separated by one period, like "4.27", and supported game titles formatted camel-case or separated by spaces, such as "TowerOfFantasy" or "tower of fantasy". Can be found by right clicking the game's .exe > Properties tab > Details (if removed, check the FModel discord).
paksDir	string	An absolute path to the game directory containing the .pak file(s).
outputDir	string	A relative path to where you want to place the exported files.
aes	string	The AES-256 decryption key to access game files. Guide on how to obtain. Leave blank if not needed.
logOutputs	bool	If set to true, every exported file's path will be logged. If set to false, these logs are skipped. Note: The logging occurs before attempting to export the file, so if the program crashes, check the last few logged files (it will not always be the last file if you have multithreading enabled).
keepDirectoryStructure	bool	If set to true, folders will be made matching those found in the .paks. If set to false, all files will be output at the root level of the outputDir.
lang	string	Language that strings should be output in. Supported languages. Useful for specifying the target language for localized resources. Will only work if the game supports the specified localization. Defaults to English.
createNewCheckpoint	bool	If set to true, will output a new checkpoint file in the /checkpoints directory. If set to false, will not create a checkpoint file. More details about checkpoints below.
useCheckpointFile	string	A relative path to a checkpoint file in the /checkpoints directory, i.e. /checkpoints/Tower of Fantasy 02-26-2024 06-08.ckpt. If set to latest, the program will look for the latest checkpoint in the /checkpoints folder that contains the gameTitle provided, i.e, between /checkpoints/Palworld 02-26-2024 00-00.ckpt and /checkpoints/Palworld 05-30-2024 00-00.ckpt, the latter will be used (will not work if you changed the file name structure). More details about checkpoints below.
export	Array(string)	A list of files to export. Supports regex. Add a colon with the desired output type at the end, such as :json or :png (see supported file types).
exclude	Array(string)	A list of files to skip exporting. Supports regex. Useful for avoiding files that crash CUE4Parse. Note: the program will try to automatically skip files that cannot be parsed by CUE4Parse, however files causing issues such as segmentation faults and heap corruption will not be skipped as they are not technically a failed parse, so they will need to be added to the excluded paths.

Note

File paths for export and exclude reside inside the game files (virtual file system). Use FModel to verify the paths that you wish to export. For example, Tower of Fantasy starts at Hotta/Content/...

I recommend specifying file extensions to avoid getting useless/unexportable files in your output. For example, you may only need a .uasset to be exported as JSON, but if you don't specify the file extension, it can export other files such as .umap, .ubulk, etc. which may be undesired.

Multiple Configs

While you can always export from multiple games in one config, you may want to target only one game without having to modify the config file every time. Multiple configs makes this easy.

Create multiple JSONs in the configs folder, naming them something easy for you to remember without spaces, i.e. blue-protocol.json, tof.json, and kartrider.json. The file names (without extensions) can be appended as arguments to the dotnet run command (see table).

Command	Selected configs
dotnet run	config.json
dotnet run all	Every JSON directly in the /configs folder
dotnet run blue-protocol tof	blue-protocol.json, tof.json
dotnet run --list	Lists all configs found in the /configs folder
dotnet run --list bp tof	Lists all configs, with bp.json and tof.json checked by default

Config List

If you pass the config list flag --list, the program will prompt you to select the configs you wish to use, listing the gameTitle for each object in the config. This is enabled by default in the binary executable unless an argument is passed.

Example:

Multiple config files detected. Select the ones you wish to execute with arrows keys, space to select, enter to confirm, or escape to exit.
  Select all
  [x] bp.json      (Blue Protocol)
> [ ] config.json  (Palworld)
  [ ] kr.json      (KartRider Drift)
  [x] tof.json     (Tower of Fantasy Global, Tower of Fantasy Global)

Checkpoints

Similar to FModel's .fbkp system, checkpoints allow you to export only new/modified files and skip unchanged files, reducing the amount of time needed to export.

A .ckpt file is a JSON that maps each file's path to its size, i.e. "Hotta/Content/Resources/FB/FB_Gulan/Warning.uexp": 3513. They are outputted to the /checkpoints folder by default, and named via gameTitle and timestamp.

If a valid checkpoint is provided, the program will only export files that have different file sizes than the one in the checkpoint (modified files), or do not have an entry in the checkpoint (new files).

Checkpoint files will always cover all the files in all paks, regardless of what your export/regexes. That way, you can export a new checkpoint while using an older checkpoint, effectively only exporting the changed files in every game update.

Tip

If you want to create a checkpoint but don't want to re-export existing files, set "createNewCheckpoint": true" and change the export paths to empty arrays.

Supported Games

By default, all games supported by FModel should technically be supported by UnrealExporter, as both use CUE4Parse under the hood. You can find working configs for games that have been tested and confirmed to be working in the /configs/examples folder. Mileage may vary depending on the files you wish to export, so check for any error messages and exclude paths accordingly. You can also open an issue to request support for other file types.

How to fix no files loading due to missing mapping file

If you are loading a game like Palworld, you will need the correct .usmap file so that the game files will correctly load into CUE4Parse. If your game's mapping file is not already provided in the mappings folder, follow the instructions below to obtain the file.

The following instructions are a trimmed version of this message by rin.

1. Install Unreal Engine 4/5 Scripting System
2. Modify the configuration file. ConsoleEnabled can be 0 or 1.

[Debug]
ConsoleEnabled = 0
GuiConsoleEnabled = 1
GuiConsoleVisible = 1

3. Launch the game
4. Output mapping file from the UE4SS Debugging Tool > Dumper tab. The file will be located alongside the game files in .../Binaries/Win64/Mappings.usmap.
   Continue reading the original post for instructions (with images!) on how to load the .usmap file in FModel.
5. Copy or move the .usmap file to UnrealExporter's mappings folder
6. Rename the file to match the gameTitle inside of the config file. For example, if "gameTitle": "MyFunGame", name the file MyFunGame.usmap.

The exporter should now be able to detect the game files.

How to fix no files loading due to incorrect AES key

If you have the wrong AES key, refer to this guide or this tool (untested) to get the correct key.