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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
LCK - Extension Details
Date Added: January 11, 2008
File Extension:  .LCK
Description 1: .LCK file extension is linked with Program Lock File. It locks database or other files from being accesses/opened or altered by more than one user at the same time. .LCK file is open when it is not in use, and it is locked when one user is working on it. It also prevents accidental overwriting and possible data/file corruption. Some of the programs that use .LCK files are MS FrontPage, Corel Paradox, Pegasus Mail, ACT! Contact Management Software and Autodesk Inventor. The .KBD file may be reference by another application; however, it is advisable not to open or alter this file.
Description 2: .LCK file extension is linked with VMware File. This is the file extension utilized by VMware or VMware Workstation as it is properly known, is an application that allows multiple operating systems to run simultaneously in the same PC. This application helps reduce hardware cost of up to 50%, allows automation and streamlining of tasks to save time and to enhance productivity. .LCK file extension and VMware Workstation are owned and developed by VMware Inc.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  VMware Workstation is supported by various operating systems
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