.m21文件扩展名，.m21文件如何打开？

.m21

文件类型1：AXMEDIS MPEG-21 File

文件说明：

Media file created with the AXMEDIS Editor; saved in a packaged content distribution format and may contain multiple types of media; may also include descriptive metadata, and DRM copy-protection information.

AXMEDIS MPEG-21 files may also be saved with an .MP21 file extension.

打开.m21文件

Mac OS

　

Windows

AXMEDIS Editor

AXMEDIS Player　

Linux

其它内容

.m21

文件类型2：MPEG-21 File

文件说明：

Multimedia file format developed by the Moving Picture Experts Group (MPEG); uses a meta-box format that contains time-based media, such as audio and video data, as well as metadata that describes the contents of the file.

MPEG-21 may also include DRM information for copy-protection.

打开.m21文件

Mac OS

Apple QuickTime Player　

Windows

Apple QuickTime Player　

Linux

来源：. m21文件