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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
H1C - Extension Details
Date Added: February 10, 2008
File Extension:  .H1C
Description 1: .H1C file extension is linked with Windows Vista File related to Assistance Platform Help. .H1C file identifies the collection references and properties that carry a projects collection data. .H1C file is comparable to Microsoft Help 2.x .HxC file. Windows Vista has a new Help engine, HelpPane.exe or Assistance Platform Client, which is not compatible to other versions of Windows. This exclusive platform is a requisite of Help Files with .H1S file extension.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: Windows Vista Help File
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