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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Y - Extension Details
Date Added: January 01, 1970
File Extension:  .Y
Description 1: The .Y file extension is tied to the Subsampled Raw YUV Image file. It is one of three files that form a split PPM file, the other two are .U and .V files. Stanford MPEG codec uses the YUV representation. QuickTime developed by Apple, Inc., is an application associated with the .Y extension. The QuickTime set of digital media creation, playback and delivery program software allows users to deliver prerecorded or live audio and video to audiences regardless of size.
File Type:   Raster Image file
Mode: Binary
Program(s) to Open:  Windows: Apple QuickTime Player with QuickTime YUV codec, Windows Media Player with YUV Genius package Macintosh: Apple QuickTime Player with QuickTime YUV codec
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