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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
XLR - Extension Details
Date Added: January 01, 1970
File Extension:  .XLR
Description 1: Files ending in .XLR involve charts or spreadsheets created using Microsoft Works. In this format, data are stored in cells arranged in columns and rows. Works refers to Microsofts entrylevel productivity suite that contains programs which are similar to those in Microsoft Office, only with limited features. In the case of spreadsheets that were created with Works 8, these can still be read by the Microsoft Excel program.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Microsoft Works or Excel (part of MS Office) Macintosh: Convert with Data Viz MacLinkPlus
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