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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
QIF - Extension Details
Date Added: March 12, 2008
File Extension:  .QIF
Description 1: Quicken personal financial management software is behind the .QIF file extension. The interchange file format is used to export files, data and transactions to other applications like Microsoft Money. Originally developed by the firm Intuit, the QIF format is now supported by a number of accounting and financial programs. A text editor can also be used to open QIF files.
Description 2: .QIF is a QuickTime Image File created then compressed by Apple QuickTime. It is occasionally referenced by QuickTime movies (or .MOV files) and utilizes the same atom types as a QuickTime movie. "idat contains the image data while "idisc has the image description. A single fork, instead of a resource fork and data fork seen in some Mac files, are used in QIF files. This allows the files to work correctly in crossplatform program applications.
File Type:   Image file
Mode: Binary
Program(s) to Open:  Windows: ACDSee Photo Manager, Apple QuickTime Viewer or Player Macintosh: Apple QuickTime Viewer or Player
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