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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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M - Extension Details
Date Added: January 11, 2008
File Extension:  .M
Description 1: .M file extension is linked with Script File [Miranda IM Language]. This is the file extension for the script file utilized by Miranda IM an instant messaging client for Windows. It offers multiprotocol support which allows other IM client users to connect to Miranda IM. It is very light on system resources as well as very fast to connect. Miranda IM doesnt require installation and can fit a single floppy disk or USB flash drive. It also offers multiple plugins of up to 350. And it is one of the most customizable and flexible IM clients of today.
Description 2: .M file extension is linked with Limbo Interface Declaration. Inferno uses Limbo as its application programming language. It is similar to C syntactically, and it has features which make it safer, simpler and bettersuited for developing concurrent distributed systems. Architectureindependent object code is generated using Limbo compiler, and it is interpreted by Inferno or compiled prior to runtime to enhance its performance. This process ensures that such applications are totally portable across all platforms being utilized by Inferno.
Description 3: .M file extension is linked with Mathematica Input File. It contains a set of instructions or functions that are utilized by Mathematica an application for generating and running math functions. .M files are saved in text format and can be viewed/edited using a standard text editor. The "init.m initialization files carry the settings necessary for loading Mathematica.
Description 4: .M file extension is linked with MATLab Function, Commands and Script Files. It is the file extension which is utilized by the function, commands and script file of this application. MATLab is a highlevel computer language and interactive environment for data visualization, algorithm development, numeric computation and data analysis. Users can enjoy the following features: faster technical solutions for computing problems; can use MATLab in various applications such as image and signal processing, communications, financial modeling and analysis, computational biology and control design, test and measurements; and many others. .M file extension and MATLab are owned and developed by MathWorks Inc.
Description 5: .M file extension is linked with BRIEF Macro Module. Basic Reconfigurable Interactive Editing Facility or BRIEF utilizes .M file extension for its macro module. It is an old file extension and unsupported application. BRIEF was a popular programming text editor in the 1908s. It was available for OS/2 and DOS, and it could run in DOS console window with early versions of Microsoft Windows. BRIEF was owned and developed by UnderWare Inc., and now Borland Software Corp.
Description 6: .M file extension is linked with Winamp3 Uncompiled Script. This is the adlib music format which can be played via Winamp with the use of Winamp plugin. .M file extension is associated with Winamp with AdPlug plugin. It is an application which offers fast, highfidelity, flexible audio and video player for Windows users.
Description 7: .M file extension is linked with Maple Common Binary File. It is the binary file created and used by Maple a leading allpurpose mathematics program. Maple provides users with advanced, highperformance mathematical computation engine with integrated symbolics and numerics which are all accessible via WYSIWYG technical document environment. .M file extension and Maple are owned and developed by Waterloo Maple Inc.
Description 8: .M file extension is linked with Cliq Accessories Datebook Modification File. This is the file extension for the datebook modification file utilized by Cliq or CliqDesk which is an application that provides a working environment that controls CliqAccessories, Quadratron and other applications that are present in a users system. Cliq usually runs on popular versions of Unix OS and Linux.
Description 9: .M file extension is linked with Amiga E Source Module. The E module is an objectoriented/unpure/procedural/functional or any other language that is quite commonly utilized by Amiga. It is basically influenced by various programming languages such as C++, Ada, Lisp and others. It features highspeed compilation, large integrated function sets, inline assembler, flexible typesystem, strong module concept, immediate and typed lists, quoted expression, exception handling, data hiding, parametic and object polymorphism, methods, LISPcells, macro preprocessing, and many others. Amiga Forever is an emulation, support and preservation package from Cloanto. New versions of Amiga offer users a blend of highquality program and unique content.
Description 10: .M file extension is linked with Winamp3 Uncompiled Script. This is the adlib music format which can be played via Winamp with the use of Winamp plugin. .M file extension is associated with Winamp with AdPlug plugin. It is an application which offers fast, highfidelity, flexible audio and video player for Windows users.
Description 11: .M file extension is linked with ObjectiveC Implementation File. This is the class implementation file utilized by applications written in ObjectiveC. .M files initialize functions and variables which can be referenced by various sources of .C files [ObjectiveC files]. .M files may also reference .H files [header files]. The standard .M file format is supported by various programs.
Description 12: .M file extension is linked with Origin AdLib Music Format. This is the file extension for the music format utilized by Origin AdLib. .M file extension is also associated with Winamp with AdPlug plugin. It is an application which offers fast, highfidelity, flexible audio and video player for Windows users. AdPlug is free, crossplatform and hardwareindependent AdLib audio player library which is generally written in C++ and released under LGPL.
Description 13: .M file extension is linked with Vertex Data Format. It is the file extension of Vertex data format that stores the vertex and face info of a polygonal mesh. Vertex data format is used by 3D applications such as 3D Studio Max a 3D graphics and animation application. It may include textures, shading effects, polygon shapes and lighting. This application is now renamed 3ds Max and it usually saves files with .3ds file extension.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Autodesk 3ds Max
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