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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
HLKX - Extension Details
Date Added: January 18, 2019
File Extension:  .HLKX
Description 1: An .hlkx file is a compressed file format created by HLK Studio. An .hlkx file, which is also known as a submission package, is what you submit for certification to Microsoft for driver Hardware Lab Kit Qualification (WHQL) . An .hlkx file must be digitally signed to be a valid submission package.
File Type:   Data file
Mode: Binary
Program(s) to Open:  Windows Hardware Lab Kit (HLK) Studio
Common:
Extension: