UCAS file format description

Many people share .ucas files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .ucas file can be edited, converted or printed with. On this page, we try to provide assistance for handling .ucas files.

1 filename extension(s) found in our database.

.ucas - Unreal Engine 4 Archive

The UCAS archive files are related to Unreal Engine 4. The UCAS file is an Unreal Engine 4 Archive. The Unreal Engine is a widely-used game engine developed by Epic Games.

Unreal Engine 4
Archive files
- / -
Unreal Engine 4 Archive related extensions:
ShadowProtect Spanned Backup
GNU Tar Archive
Liquidware LouZip Archive
DIVA-GIS Exported Project
Stampede Linux Package
Zimbra Compressed Package

Naturally, other applications may also use the .ucas file extension. Even harmful programs can create .ucas files. Be especially cautious with .ucas files coming from an unknown source!

Can't open a .ucas file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .ucas file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

cas, uas, uca, ucs

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Bitdefender CAS Data
Need for Speed Rivals Game Data
Homeworld Unicode Strings Data
Quest Compiled Adventure Game
Videoton TV Computer Tape Data
Borland Combined C/Assembly Source Code

Operating systems

DataTypes.net currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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DataTypes.net >> UCAS file