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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
HHC - Extension Details
Date Added: January 01, 1970
File Extension:  .HHC
Description 1: .HHC file extension is linked with HTML Help Table of Contents. This file stores the table or content or site map utilized by Microsoft HTML Help. It also offers help documentation via web browser. .HHC file extension is also associated with Microsoft Windows a popular Operating System from Microsoft Corporation. Windows and other Microsoft operating systems can run on various platforms such as: PCs, servers and embedded devices.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: HTML Help Workshop
Common:
Extension: