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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
HDZ - Extension Details
Date Added: January 01, 1970
File Extension:  .HDZ
Description 1: .HDZ 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: .HDZ file extension is linked with Compressed Poser Hand Pose file, which is a compressed 3dimensional character modeling program. It involves dataspecific character hand poses such as hand movements and finger placements or positions. .HDZ and Compressed Poser Hand Pose file is owned by Smith Micro software. The file opens directly and the uncompressed version uses .HD2 file extension.
File Type:   3D Graphics, CADCAM file
Mode: Binary
Program(s) to Open:  Windows & Mac: Smith Micro Poser
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