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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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ULW - Extension Details
Date Added: February 01, 2009
File Extension:  .ULW
Description 1: .ULW is the extension linked to the Raw uLaw Audio file. It is an audio file format containing raw CCITT G.711 ulaw (pronounced as "mulaw) audio data that US telephony uses. Although ufiles have no defined standard file extension, there is still the option of using the .ULAW file extension.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Windows: FMJSoftware Awave Audio, MPEG4IP, Wave Flow Macintosh: NCH Switch Sound File Conversion Software
Common:
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