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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
HIV - Extension Details
Date Added: January 01, 1970
File Extension:  .HIV
Description 1: .HIV file extension is linked with Windows NT Registry Hive. This is an ondisk file format for Windows registry. Users should not attempt at editing .HIV files directly while running their Windowsbased PCs since serious installation damages can occur. Windows NT was first released in July 1993. It is a family of operating systems developed by Microsoft. It was designed as a powerful, highlevellanguagebased, multiprocessing, multiuser, processorindependent OS with comparable features to UNIX. Windows NT was intended to complement Windows consumer versions that were based on MSDOS. It was the first fully32bit version of Windows.
File Type:   System File
Mode: Binary
Program(s) to Open:  should not be opened or edited while running Windows
Common:
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