Home : File Types : LOCK File (2 File Associations)

.LOCK File Extension

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File Type 1Lock File

DeveloperN/A
Popularity
4.1 (19 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryMisc Files
FormatText and Binary

Text and Binary

This file is saved in a plain text format or a binary format. If in a plain text format, it can be viewed with a text editor.

Definition

File used by various operating systems and programs to lock a resource, such as a file or a device; typically contains no data and only exists as an empty marker file, but may also contain properties and settings for the lock.

More Information

LOCK files signal to applications that a resource should not be used until the lock is released. This is useful for programs that need to prevent concurrent access to critical resources. For file locking, programs typically create a new file and add the ".lock" extension for the original filename. For example, a lock file for "example.file" would be "example.file.lock."

LOCK files are commonly seen on Unix-based systems, including Red Hat Linux system file locks. Other examples of LOCK files include Mozilla's parent.lock file, which locks Windows Firefox profiles, and Apache Web Server lock files, which are created using the LockFile directive.

Program(s) that open .LOCK files
Microsoft Windows LogoWindows
Mozilla Firefox
Microsoft OneDrive
Mac OS X LogoMac OS
Microsoft OneDrive
Linux LogoLinux
Mozilla Firefox
Apache Web Server
Updated 8/15/2013

File Type 2Minecraft World Lock File

DeveloperMojang Specifications
Popularity
2.5 (6 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryGame Files
FormatBinary

Binary

This file is saved in a binary format, which requires a specific program to read its contents.

Definition

Lock file named session.lock and used by Minecraft, an open-ended block construction game; included as part of the data for a Minecraft world; enables a Minecraft application to lock the world so that only one Minecraft instance has it open; saves a timestamp for when the world was last accessed.

More Information

Minecraft uses a locking policy such that the last instance to open the world is the world owner. If the contents of the session.lock file change after an instance has written its timestamp, the instance aborts and gives up the lock.

Program(s) that open .LOCK files
Microsoft Windows LogoWindows
Mojang Minecraft
Mac OS X LogoMac OS
Mojang Minecraft
Linux LogoLinux
Mojang Minecraft
Updated 4/22/2011