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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
HLP - Extension Details
Date Added: January 01, 1970
File Extension:  .HLP
Description 1: .HLP file extension is linked with Windows Help File. It contains the documentation for Windows OS or Windows applications. This file is compiled using MS Help Workshop [HCW.exe]. It can be viewed using Windows Help Viewer that is integrated into the operating system. .HLP file can be opened directly and it can be referenced by an open application.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: Help Explorer Viewer, Microsoft Help Workshop, Microsoft Windows Help Viewer; Mac: Help Explorer Viewer
Common:
Extension: