What is the File Extension .U?
During software and programming language development, programmers select file extensions for different programs or languages based upon their own preferences. As a result, some files share a common extension even though the contents of the files are unrelated, which is the case with .u files.
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Identification
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A file with the .u file extension is known as a Subsampled Raw YUV image, an Unreal Tournament class package or an AU Audio file.
Function
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A Subsampled Raw YUV image files contain one of three parts of an image file that has been divided into three sections to attain more manageable file sizes. An Unreal Tournament class package contains settings used by a first-person shooting video game known as Unreal Tournament, while an AU Audio file contains a song or other audio clip.
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Use
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Subsampled Raw YUV images are saved along with two other files---.y and .v files---and together these three files represent one large .ppm file. The files can be viewed together using a program such as Apple QuickTime Player with QuickTime YUV codec or Windows Media Player with YUV Genius package.
Sources
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Unreal Tournament class package files are saved with the initial installation of the game, but users can also download custom .u files that provide new graphics or settings. AU Audio files can be played using Apple QuickTime Player or RealNetworks RealPlayer and are sometimes saved with an .au extension rather than .u.
Considerations
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Subsampled Raw YUV image files are the most common of the three .u files, according to FileInfo.com.
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