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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:
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QDF - Extension Details
Date Added: January 01, 1970
File Extension:  .QDF
Description 1: .QDF is a file extension referring to the electronic or document form that Snapform Designer developed. It is used in saving data in vectorbased format, one that allows for zooming and printing without diminishing quality. The QDF format sometimes also contains form fields that users can fill in themselves. A .QDF format resembles the .PDF format, only it makes use of proprietary Ringler Snapform formatting.
Description 2: QDF stands for Quicken Data File. It is the extension for the financial data format that Quicken personal finance program software uses for Windows systems. QDF files save transactions, accounts, portfolios as well as balance info. The .QDF file is described as the primary data file that is saved by the Quicken application. Quicken is capable of recreating other related ".q** files, provided the QDF file stays valid.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Intuit Quicken
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