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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
H1F - Extension Details
Date Added: January 01, 1970
File Extension:  .H1F
Description 1: .H1F file extension is linked with Microsoft Windows Assistance Platform Client Help File. .H1F file is a decompiled .H1S file. The Assistance Platform Client is a requisite to display Help files that have .H1S file extension. The Assistance Platform Client in Windows Vista is customizable by system builders, enterprise customers and OEMs, but not by third party applications.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: Microsoft Windows Assistance Platform Client
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