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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
ULF - Extension Details
Date Added: February 01, 2009
File Extension:  .ULF
Description 1: The file extension .ULF refers to data files that are formatted in Universal List Format (ULF). ULF files feature a list of elements that are a lot like the one found in an .XML document. Geographic Information Systems (GIS) program applications find the ULF files handy and use them for storing vertexes and coordinates.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Geosystems MRF Mapping Tool Kit
Common:
Extension: