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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
LCL - Extension Details
Date Added: March 11, 2008
File Extension:  .LCL
Description 1: .LCL file extension is linked with QIP File. This is the file extension utilized by QIP data files. QIP is freeware software for online communications. It is one of the wellknown instant messengers and is used by thousands of internet users. .LCL file extension and QIP are owned and developed by Ilgam Zulkorneev.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Mac: QIP
Common:
Extension: