Opening LCK Files

The LCK file type is primarily associated with EXSi.

LCK	File extension: LCK
	File type:	network file system lock

What is an LCK file?

LCK files mostly belong to EXSi by Vmware. LCK is the filename extension of a "lock file" which various applications use to prevent multiple users from editing or accessing a single file, file system, database, or asset concurrently. EXSi, Base, pacman, Paradox, Act! CRM, Pegasus Mail, Dreamweaver, Inventor, and HTML Help Workshop are among programs that assign LCK filename extension to lock files. ThinApp, a program for virtualizing, packaging, and deploying portable applications uses a different type of LCK file to save registry information in a portable Windows executable (EXE file).

How can I open an LCK file?

You need a suitable software like EXSi to open an LCK file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your LCK file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a LCK file directly in the browser:. Just drag the file onto this browser window and drop it.

Online LCK Text Viewer

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Programs that open and convert LCK files:

EXSi by Vmware
See the previous paragraphs to learn more about the main application. LCK files are often referred to as EXSi miscs because this type of file is primarily created or used by this software.
Act! CRM (database lock) by Act!
Act! CRM is a customer relationship management solution available as a Windows desktop application. It uses an LCK file to lock a database so that other users are not able to access the database when one user is writing or reading data to or from that database. This file format is classified as Misc.
Base (database lock) by Apache
Base is a free and open source relational database management system with a graphical user interface. It uses an LCK file to control multi-user access to a database (ODB file). The file prevents multiple users from editing the ODB file at the same time. This file format is classified as Misc.
Dreamweaver (lock) by Adobe
Dreamweaver is an integrated development environment for creating web applications. It uses an LCK file to control multi-user access to a web development project. This reduces the chance of file corruption since only one user will be allowed to edit the project file at a given time. This file format is classified as Misc.
FrontPage (project lock) by Microsoft
FrontPage is a discontinued What You See Is What You Get (WYSIWYG) editor for creating and managing websites. It uses an LCK file to lock a project to a single user –preventing other users from editing the project until the current user has closed it. This file format is classified as Misc.
HTML Help Workshop (help document lock) by Microsoft
HTML Help Workshop is a help document authoring software with support for Help 2.x format. When editing a help document, HTML Help Workshop uses an LCK file to prevent other users on a PC from editing the same document until the current user has closed it. This file format is classified as Misc. Related links: Microsoft Help 2
Inventor (lock) by Autodesk
Inventor is a computer-aided design two-/three-dimensional product design and documentation software. It uses a file named Lockfile.LCK to control who has access to a given folder. This file format is classified as Misc.
pacman (package database lock) by pacman Developers
pacman is a package manager for Arch-based Linux distributions. It uses a db.lck file to lock its application package database. This file prevents other users from accessing the package database when it is in use by other users. This file format is classified as Misc.
PageMaker (database) by Adobe
PageMaker is a discontinued desktop publishing application with tools for creating flyers, posters etc. It used a database saved in an LCK file. This file format is classified as Database.
Paradox (database lock) by Corel
Paradox is a relational database management system distributed as part of WordPerfect productivity software suite. An LCK file generated by Paradox contains information which the program uses to manage multi-user access to a database file. It ensures only one user can write data to a database at a time. This file format is classified as Misc.
Pegasus Mail (mailbox lock) by David Harris
Pegasus Mail is a cross-platform email client application. The MAILBOXP.LCK file generated by Pegasus Mail contains information used to ensure only one user can access the a mailbox at a time. This file format is classified as Misc.
ThinApp (application registry data) by Vmware
ThinApp is an application virtualization and deployment program. It provides tools which isolates applications from their underlying operating system. It uses an LCK file to save a portable application's registry information. This file is saved as a part of a Windows executable (EXE). This file format is classified as Data.

LCK file format:

To find out what program is needed to open LCK files, you need to determine the file format. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. So a detailed analysis of a file is vital in order to determine the format and the associated program. Our evaluation of the LCK files looks like this:

The LCK file extension is used very often and includes very many different file formats. The two most popular formats are as follows:

15% of all LCK files are based on the well-known JPG file format. JPEG is the standard image format for lossy and compressed image data. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. The files are on average 93 KB in size and range from 29 KB to 450 KB. The file type was primarily used more than 10 years ago. Several words can almost always be found in the files, e.g. Exif. Such files sometimes refer to production and djef.
9% of all LCK files start with the bytes 00 24 crucial for this file format. If you open these files in a text editor, you can view and read the content yourself. Most of these files are 38 bytes to 40 bytes in size. The file name db.lck is characteristic of these files.

The remaining 76% of all LCK files are different files with different signatures, the following 10 formats can be found: Paradox Lock, XML, PDF, uuid and HSQLLOCK. They are often associated with slot or lock. If you want to find out which format your LCK file belongs to, just click on the button "Choose your .lck file to analyze".

Technical Data for LCK File Extension

File classification:

Misc

Related files:

tvr, transact, lock, bpn, vmxf, lkc, sso, btr, properties, pln, 1, dat, tlog, cache, ipt, jpg, ax, log, pdf, ctrl

Mime type:

application/octet-stream

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: assoc
EXEFile: %ProgramFiles%\Quantum Digital Security\CleverCrypt Lite\\assoc.exe %1

an lck network file system lock is a special file format by Vmware and should only be edited and saved with the appropriate software.

How to solve problems with LCK files

Associate the LCK file extension with the correct application.
Update your software that should actually open network file system locks. Because only the current version supports the latest LCK file format. Search, therefore, e.g. on the Vmware manufacturer website after an available EXSi update.
To make sure that your LCK file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .LCK file online - secure, fast, and no downloads needed.