.UCAS Extension de fichier
Unreal Compressed Asset File
| Développeur | Epic Games |
| Popularité |
3.7 | 3 Votes |
Qu'est-ce qu'un fichier UCAS ?
A UCAS file is a container used by Unreal Engine to store cooked game assets in a compressed, runtime-ready form. It stores binary asset data, such as textures, models, audio, and other bulk data, that the engine loads during gameplay. UCAS files pair with a table-of-contents file (often a .UTOC or .TOC file) that directs the engine to the location of each asset stored inside the container.
Plus d'informations
Unreal Engine began using UCAS/UTOC containers as part of newer IO Store and Zen Loader packaging methods (used in recent UE4/UE5 workflows) to improve load performance and reduce runtime overhead. Game developers produce UCAS files when they "cook" and package a project for distribution; the engine then reads UCAS containers at runtime rather than loading many separate files. Because UCAS holds cooked (engine-ready) data, it is not a source or editable asset format, it is a delivery format meant for the running game.
Comment ouvrir un fichier UCAS
UCAS files are not meant to be opened. Instead, games built with the Unreal Engine load the files during gameplay.
However, you can open or extract files from a UCAS container with Unreal Engine tools or community utilities that support the IO Store format. The official UnrealPak/IOStore tools included with the engine can list and extract packaged content when present in your engine installation.
To do this:
- Navigate to your Unreal Engine installation folder: Engine/Binaries/Win64/
- Make sure you have the UCAS file and UTOC file, open a command prompt, and run: UnrealEditor-Cmd.exe IoStore -List -Container="path\to\file.ucas" -TOC="path\to\file.utoc"
- Extract the contents by running the following command: UnrealEditor-Cmd.exe IoStore -Extract -Container="path\to\file.ucas" -TOC="path\to\file.utoc" -Output="path\to\output_folder" This extracts .uasset, .uexp, .ubulk, and other files to the output folder.
Community tools, such as Archengius ZenTools, also read and convert UCAS/UTOC containers for modding or analysis, but results vary by engine version and game (some UCAS files are serialized specifically for a particular engine build).