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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
HDP - Extension Details
Date Added: January 01, 1970
File Extension:  .HDP
Description 1: .HDP file extension is linked with HD Photo File. It is the compressed raster image file format which is developed my Microsoft. It is used mainly for photographic images and it is similar to .JPG file but uses superior compression. This file may also use lossless compression. The standard format of .HDP file is supported by various programs.
File Type:   Bitmap Image File
Mode: Binary
Program(s) to Open:  Windows: Adobe Photoshop with HD Photo plugin, Alchemy Mindwork Graphic Workshop Professional, Microsoft HD Photo Device Porting Kit, Microsoft Photo Info; Mac: Adobe Photoshop with HD Photo plugin
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