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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
HHP - Extension Details
Date Added: April 02, 2009
File Extension:  .HHP
Description 1: .HHP file extension is linked with Microsoft HTML Help Project File. This is the file extension for the project file utilized by Microsoft HTML Help the standard help tool for Windows platform. Users can utilize HTML Help to generate online help for software applications or to create multimedia/web site contents. HTML Help is ideal for various applications such as training guides, electronic newsletters, software help and interactive books.
File Type:   Internetrelated File
Mode: ASCII
Program(s) to Open:  Windows: MS HTML Help
Common:
Extension: