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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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RFL - Extension Details
Date Added: January 01, 1970
File Extension:  .RFL
Description 1: Files with the extension .RFL identify Reason ReFill Sound Bank audio files. It refers to the component package for the song creation application Reason that features an advanced sequence and a virtual studio rack. Such files sometimes contain song files, samples, patches and .AIF, .REX and .WAV files that are compressed to nearly half the original files size when kept in ReFills. Accessing, playing and editing .RFL files requires the installation of the Propellerhead Software Reason application.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Mac and Windows: Propellerhead Software Reason
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