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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
QEL - Extension Details
Date Added: March 12, 2008
File Extension:  .QEL
Description 1: .QEL stands for Quicken Electronic Library. It contains online banking info that is associated with Quicken accounts. The .QEL files store login info along with a list of banking institutions that are used when downloading account data over the Net. If errors are encountered when accessing Quicken data online, it is fine to delete the QEL file. It will be created automatically the next time an Internet bank connection is established.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: Intuit Quicken
Common:
Extension: