Opening a UPK File

The UPK file type is primarily associated with Unreal.

UPK	File extension: UPK
	File type:	game data

What is a UPK file?

UPK files mostly belong to Unreal by Epic. A UPK file contains data for video games based on Unreal engine version 3. A single UPK file can store various kinds of data ranging from character models to audio clips, textures, fonts, skills, fonts, animation trees, modification packages, and metadata. Unreal Tournament 3, Smite 3, Mass Effect, and Rocket League are among programs that support UPK game data format. Epic, the developer of Unreal engine has stopped shipping Unreal engine 3.

How to open UPK files

You need a suitable software like Unreal to open a UPK 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 UPK file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a UPK file directly in the browser:. Just drag the file onto this browser window and drop it.

Online UPK Text Viewer

Choose your .upk file to analyze

or drag and drop it here

Online File Viewer

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UPK file format:

Every file has a defined file format, i.e. how the data is arranged in the file. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. So a detailed analysis of a file is vital in order to determine the format and the associated program. Below you will find our evaluation of the UPK files:

UPK is a very widely used file extension. The file type mainly uses a special format. The file formats most commonly found in UPK files are:

• 95% of all UPK files save the data in 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. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. The average file size is 1 MB with most files being between 17 KB and 24 MB in size. The file type is old but is used even today. The keywords None are typical for these files. Files like these are sometimes connected to assets, skin, body, octane, voice, game, batman and cache.
• 1% of all UPK files use the same file format, which can be identified by the letters "7HMMd" at the beginning. They consist of illegible, cryptic characters. The file size is in the range of 6 KB to 2 MB. Certain words are almost always found in the files, such as 7HMMd and None. A usual file name is H7AdventureGeneral.upk or H7Config.upk. Files like these are about creature, music and hero.

All other UPK files (4%) have no uniform format. These files sometimes refer to engine, player, shader, anim, startup, uilibrary or boost. You can get all the details of your UPK file by dragging it onto this page or by clicking the button "Choose your .upk file to analyze" above.