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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
HDF - Extension Details
Date Added: October 09, 2008
File Extension:  .HDF
Description 1: .HDF file extension is linked with Amiga Hard Disk Image. It is also referred to as hardfile since it is the hard disk equivalent of .ADF and .ADZ files. Amiga Forever is an emulation, support and preservation package from Cloanto. New versions of Amiga offer users a blend of highquality program and unique content.
Description 2: .HDF file extension is linked with Help File. This is the file extension for the help file utilized by Help Development Kit a hypertext help database development tool which has 2 help engines, a help compiler with cross reference tool and it supports the creation of DOS help databases, WinHelp, DESQview/X help source files, OS/2 [IPF].
Description 3: .HDF file extension is linked with Hierarchial Data Format file a multiobject and library file format that facilitates numerical and graphical data transfer between machines. This application is free and it consists of the HDF command utilities, test suite and HDF library. HDF file is a versatile application, supports various data models, it is selfdescribing, flexible, portable and extensible. .HDF file extension and HDF application are owned and developed by The HDF Group.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Basic ENVISAT Atmospheric ToolBox, Geospatial Data Abstraction, NCSA HDFView, Space Research HDF Explorer, THG HDF Utilities; Mac: Basic ENVISAT Atmospheric Toolbox, NCSA HDFView, WaveMetrics IGOR Pro; Unix: Basic ENVISAT Atmospheric Toolbox, Geospatial Data Abstraction, NCSA HDFView
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