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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
XLC - Extension Details
Date Added: January 01, 1970
File Extension:  .XLC
Description 1: The .XLC file extension has to do with Excel charts. Its format was created with Microsoft Excel spreadsheet data. The charts can be generated from a data selection by choosing "Insert and moving to "Chart within Excel. Saving these files can be done either within the particular Excel spreadsheet (.XLS files) or separately as .XLC files.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: Microsoft Excel
Common:
Extension: