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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
MUF - Extension Details
Date Added: January 01, 1970
File Extension:  .MUF
Description 1: .MUF file extension is linked with Alpha Five Access Control File. .MUF files are created temporarily to control the number of people who are simultaneously accessing a database. Alpha Five deletes .MUF file. When a crash occurs, the .MUF file may be left on the disk to prevent other users from accessing the program. When this happens, all users must exit Alpha Five and the .MUF file should be deleted manually.
File Type:   Temporary File
Mode: Binary
Program(s) to Open:  Windows: Alpha five
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