U Types

Principal U Type

.U

File Format:	.u
Category:	Unreal Tournament Class Package

The U file contains settings used by Unreal Tournament.The U file is stored within the Unreal System directory, i.e. "\Unreal\System\Engine.u".The U file may be replaced with custom class packages.

Developer:	Epic Games
Division:	Game Files
Key:	HKEY_CLASSES_ROOT\.u

Software Programs That Open The Unreal Tournament Class Package:

Dragon UnPACKer by Open Source

Windows

Unreal Tournament by Epic Games

Windows

Mac

Linux

UnrealEd by Epic Games

Windows

Unreal Development Kit by Epic Games

Windows

Other U Descriptions

.U

File Format:	.u
Category:	AU Audio File

The U file is an audio container format typically used to store encoded audio data. The U file is introduced by Sun Microsystems and also used by MusicKit for the NeXT operating system. It contains a header that includes six 32-bit words, an optional information section, then the audio data.

Developer:	RealNetworks
Division:	Audio Files

Software Programs That Open AU Audio File Files:

Microsoft Windows Media Player by Microsoft Corporation

Compatible with:

	Windows
	Windows Phone

Mac

Apple QuickTime Player by Apple

Compatible with:

Windows

Mac

.U

File Format:	.u
Category:	Subsampled Raw YUV Image

Subsampled raw image created by ppmtoyuvsplit, used for storing image data in a format required by the Stanford MPEG codec.ppmtoyuvsplit is a Unix-based command-line utility that splits .PPM files into .Y, U, and U files

Developer:	Microsoft Corporation
Division:	Raster Image Files

Software Programs That Open Subsampled Raw YUV Image Files:

Microsoft Windows Media Player by Microsoft Corporation

Compatible with:

	Windows
	Windows Phone

Mac

Apple QuickTime Player by Apple

Compatible with:

Windows

Mac

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U File Complications

Common Problems Opening U Files

Missing Dragon UnPACKer

When you double-click your U file, you may see a dialog box from your operating system stating that it "Cannot Open This File Type". When this happens, it is commonly due to Dragon UnPACKer missing in %%os%%. This will prevent you from double-clicking to open the U file because the OS doesn’t know how to handle it.

Tip: If you have another software that you know opens U files, you can select it by hitting the "Show Apps" button.

Wrong Version of Dragon UnPACKer is Installed

Your Unreal Tournament Class Package file is incompatible with Dragon UnPACKer because you might have the wrong version installed. Visit the Open Source website to download (or purchase) the latest version of Dragon UnPACKer. This problem is most common when you have an older version of the software application, and your file was created by a newer version that it cannot recognize.

Tip: Find clues on the correct software version by right-clicking your U file and clicking "Properties".

Conclusion: The majority of U file opening issues are due to not having the correct Dragon UnPACKer version installed.

Other U File Opening Causes

Although you might already have Dragon UnPACKer or another U-associated software installed on your computer, you can still encounter problems opening Unreal Tournament Class Package files. If you are continuing to have errors with loading U files, other external issues might be to blame. These issues include:

• File references in the Windows Registry for U are wrong
• Corruption of the U file description inside the Registry
• Partial installation of Dragon UnPACKer that did not fully complete
• U file corruption
• Your U has adversely impacted by malware
• Device drivers for U-related hardware are out-of-date
• Too many applications are open on your PC to load your Unreal Tournament Class Package file successfully