Opening a UKX File

The UKX file type is primarily associated with Unreal Engine.

UKX	File extension: UKX
	File type:	asset package

What is a UKX file?

UKX files mostly belong to Unreal Engine. UKX files are specialized container files used mainly within the Unreal Engine ecosystem.
These files carry assets and animation data needed for game development. They are not simple archives; their structure is designed for engine-specific use.

Unreal Engine assets: Most UKX files package game assets such as animations and models for games built with Unreal Engine.

Lineage II game data: A sizable group of these files archives game-related data for Lineage II.

Kingsoft Office archives: A few files are used to hold data for Kingsoft Office, including animation data.

FilExt.com note: This proprietary format requires dedicated tools, such as the Unreal Engine Editor, to open and edit the content. Using general archive utilities may corrupt the data or show it incompletely.

How to open a UKX file

You need a suitable software like Unreal Engine to open a UKX file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your UKX file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a UKX file directly in the browser:. Just drag the file onto this browser window and drop it.

Online UKX Text Viewer

Choose your .ukx file to analyze

or drag and drop it here

Online File Viewer

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UKX file extension format:

To view or edit UKX files you need to know the file format, because it determines how the data in this file is stored. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). If the file extension or signature does not match the file format, errors will occur when opening or editing the file. If there are problems opening a file, you must first determine the file format used. Our evaluation of the UKX files looks like this:

The UKX file extension is rarely used and includes various formats for various programs. However, the following two file formats are common:

• 60% of all UKX files are based on the well-known Unreal file format. This Unreal Engine Package by Epic Games may contain textures, maps, music files, 3D models, or game settings. The package can be created and edited using the Unreal Development Kit. They consist of unreadable binary data. The files are 140 KB to 15 MB in size, with a median of 2 MB. This is an old file type which is rarely used today. The keywords None and Body are typical for these files. The file name AuntMayAnimations.ukx or HPCharacters.ukx is typical for these files. Files like these are about animations, anim, aunt and clone.
• 20% of all UKX files start with the bytes 4C 00 69 00 6E 00 65 00 61, which are crucial for this file format. They consist of unreadable binary data. UKX files are between 6 MB and 100 MB in size. The following keywords are characteristic: Lineage2Ver111. Files like these are sometimes connected to lineage, monsters, effect and meshes.

All other UKX files (20%) have different formats, frequently e.g. KFXArchive. Tagged as anims, dark, fighter or weapons. If you want to find out what your UKX file contains, drag and drop it onto this page.