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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
RNG - Extension Details
Date Added: January 01, 1970
File Extension:  .RNG
Description 1: .RNG is the extension associated with the RELAX NG file. This type of file is used to validate .XML documents. An .RNG file utilizes simple schema language for XML. The focal point of the language is the description as well as validation of the content and structure of XML documents.
Description 2: .RNG is the extension tied to Nokia Composer Ringtone. It refers to the monotone ringtone format that Nokia cellular phones use. Create this type of file with the help of the Nokia Composer application program that comes with certain kinds of Nokia phones. Since .RNG files feature a monophonic format, it is only possible to play one note at a time.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Windows: AudioWare Ringtone Converter
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