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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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M1V - Extension Details
Date Added: November 09, 2008
File Extension:  .M1V
Description 1: .M1V file extension is linked with Moving Pictures Experts Group video [MPEG1 IPB]. MPEG1 was designed to compress daw digital CD audio and video down to 1.5 Mbit without compromising the quality. Currently, MPEG1 is the most widely compatible lossy video/audio file format and it is used by an array of technological products. One of the bestknown technological breakthroughs is the MP3 audio format.
File Type:   Movie, video, multimedia file
Mode: Binary
Program(s) to Open:  Windows & Mac: Apple QuickTime Player or other video player/s
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