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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
HDD - Extension Details
Date Added: January 01, 1970
File Extension:  .HDD
Description 1: .HDD file extension is linked with Parallels Workstation virtual hard disk file. .HDD files carry the virtual disk image/s of the operating system and its programs, and they are virtualized in Parallels Workstation an application that offers easytouse and costeffective solution that lets users run Windows, Linux and other operating systems in one PC without the need of rebooting. Parallels Workstation also offers stable, secure and networked features.
File Type:   Disk Image [ISO] Binary File
Mode: Binary
Program(s) to Open:  Windows, Mac & Unix/Linux: Parallels Workstation
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