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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
YDL - Extension Details
Date Added: April 09, 2008
File Extension:  .YDL
Description 1: The YDL file extension is linked to Powerflip YAODL3D image files. YAODL is short for "Yet Another Object Description Language. YDL is the 3D modeling format that SGIs Powerflip application used. It supports polygons, object properties, NURBS, texture coordinates, quadmeshes and facet, vertex and object colors. YOADL format had limited support and SGI no longer utilizes it.
File Type:   Image file
Mode: Binary
Program(s) to Open:  Windows and Unix: SGI PowerFlip
Common:
Extension: