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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
PDS - Extension Details
Date Added: September 09, 2008
File Extension:  .PDS
Description 1: .PDS is the extension for slide show or video project files that are created using the digital videoediting software called PowerDirector. These files often include both DVD and video data needed for DVD creation. A .PDS file is usually built or generated from a template that comes with the PowerDirector application program.
Description 2: PDS is short for Planetary Data System file. It is a scientific data format that NASA (National Aeronautics and Space Administration) created for use in storing solar, lunar and planetary data gathered from space and earth missions. PDS files usually include labels written in ODL (Object Description Language). Such labels utilize keywords to describe data or info within the file.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: NASA PDS Tools Package
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