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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
QF - Extension Details
Date Added: December 03, 2009
File Extension:  .QF
Description 1: File extension .QF is associated with the Nokia Maps Version File. Such files contain configuration data along with version info for the mobile phone mapping application Nokia Maps. The .QF files are ordinarily stored within the phones memory cards root directory. Overall, modifying the Maps QF file is not encouraged. However, uninstalling Maps 3.0 may require deleting the QF file and the "cities folder.
File Type:   Settings file
Mode: Binary
Program(s) to Open:  Windows: referenced by Nokia Maps, edit with a text editor
Common:
Extension: