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File type: Subsampled Raw YUV Image, Unreal Tournament Class Package File, AU Audio

 

YUV is a representation that is used by the Stanford MPEG codec. There are three files .Y .U and .V which are created from a PPM split file.

These files are also used by the Unreal Tournament game and contain the settings which are used by the game.

The file is usually stored in the System folder under the Unreal Tournament installation folder for instance 'Unreal\System\Engine.u.' These files may also be replaced with custom classes. .U Files are also used as audio containers and are used typically for storing encoded audio data.

These files were first introduced by the Sun Microsystems and were also used by the MusicKit application for the NeXT operating system. These files usually consist of a special header which includes the six 32-bit words of data and also optionally has an information section and that is then followed by the audio data.

 

Detailed information 

 

Category: Data File
File format: Proprietary
Open with Windows: Apple QuickTime Player with QuickTime YUV codec, Windows Media Player with YUV Genius package, Edit with Epic Games UnrealEd
Open with Linux:

File type: Microsoft Mail Unknown File

 

What is

UNK files are very rare files and one does not encounter these files in every day. UNK stands for UNKNOWN and that is a good indicator of what these files are. These files are produced by the Microsoft Mail program. Microsoft Mail is a Microsoft product that is the successor of the Microsoft Outlook application and it virtually identical to it in most respects. It allows users to read mails via IMAP or POP mails and also send mails using SMTP protocol.
When the Microsoft Mail software receives a mail with an attachment that it was unable to identify, probably because the file was corrupt and not transferred properly, it converts the files into .UNK files.
These conversions usually takes place when the original file was not passed across someone's gateway properly due to either security reasons or company policies which disallow those kind of files to be distributed within the network, sometimes these conversions are also done on files that are simply too large beyond the threshold limit of the common gateway.
Once a file has been corrupted and converted into an .UNK file then there is no way of recovering the original file or reading its contents.

Detailed information 

Category: Data File
File format: Proprietary
Open with Windows: Microsoft Mail
Open with Linux:

 

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