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! |
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| M21 - Extension Details | |||||
| Date Added: | September 09, 2008 | ||||
| File Extension: | .M21 | ||||
| Description 1: | Moving Picture Experts Group or MPEG developed the .M21 multimedia file format. It makes use of the metabox format and includes timebased media like video and audio data along with metadata that provides a description of the file contents. An MPEG21 file sometimes includes DRM info, for purposes of copyright protection. | ||||
| File Type: | Video file | ||||
| Mode: | Binary | ||||
| Program(s) to Open: | Mac and Windows: Apple QuickTime Player | ||||
| Common: | |||||
| Extension: | |||||
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