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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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QPH - Extension Details
Date Added: March 12, 2008
File Extension:  .QPH
Description 1: .QPH is short for Quicken Price History file. A file with this extension includes a pricelist that was either manually entered or downloaded for investments in a particular Quicken account. QPH files provide historical prices of stocks as well as other securities. These files are not stored in the main Quicken .QDF file, but rather are saved separately.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: Intuit Quicken
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