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| 延期 | 文件类型开发人员 | 文件类别 | 文件类型描述 | 软件 | 软件开发人员 |
|---|---|---|---|---|---|
| .M15 | Moving Picture Experts Group | 视频文件 | MPEG Video File | Apple QuickTime Player | Apple |
| .M1A | Open Source | 音频文件 | MPEG-1 Audio File | Apple QuickTime Player | Apple |
| .M1V | Roxio | 视频文件 | MPEG-1 Video File | Apple QuickTime Player | Apple |
| .M21 | AXMEDIS Products and Services | 视频文件 | AXMEDIS MPEG-21 File | Apple QuickTime Player | Apple |
| .M2A | Unknown Developer | 视频文件 | MPEG-1 Layer 2 Audio File | Apple QuickTime Player | Apple |
| .M2S | Maxthon | 设置文件 | Maxthon 2 Browser Skin File | Apple QuickTime Player | Apple |
| .M2V | Webteh | 视频文件 | MPEG-2 Packetized Elementary Stream | Apple QuickTime Player | Apple |
| .M4A | Apple | 音频文件 | MPEG-4 Audio File | Apple QuickTime Player | Apple |
| .M4P | Apple | 音频文件 | iTunes Music Store Audio File | Apple QuickTime Player | Apple |
| .M4U | Open Source | 视频文件 | MPEG-4 Playlist | Apple QuickTime Player | Apple |
| .M4V | Apple | 视频文件 | iTunes Video File | Apple QuickTime Player | Apple |
| .M75 | Moving Picture Experts Group | 视频文件 | MPEG Video File | Apple QuickTime Player | Apple |
| .MAC | Apple | 光栅图像文件 | MacPaint Image | Apple QuickTime Player | Apple |
| .MID | Open Source | 音频文件 | MIDI Audio File | Apple QuickTime Player | Apple |
| .MIDI | Synthesia LLC | 音频文件 | MIDI File | Apple QuickTime Player | Apple |
| .MJP | LG Electronics | 视频文件 | MJPEG Video File | Apple QuickTime Player | Apple |
| .MOO | Apple | 视频文件 | Apple QuickTime Movie Clip File | Apple QuickTime Player | Apple |
| .MOOV | Apple | 视频文件 | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOV | Apple | 视频文件 | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOVIE | Apple | 视频文件 | QuickTime Movie File | Apple QuickTime Player | Apple |
| .MP21 | AXMEDIS Products and Services | 视频文件 | AXMEDIS MPEG-21 Object | Apple QuickTime Player | Apple |
| .MP2V | Roxio | 视频文件 | MPEG-2 Video File | Apple QuickTime Player | Apple |
| .MP4 | Moving Picture Experts Group | 视频文件 | MPEG-4 Video File | Apple QuickTime Player | Apple |
| .MP4V | Moving Picture Experts Group | 视频文件 | MPEG-4 Video File | Apple QuickTime Player | Apple |
| .MPA | Unknown Developer | 音频文件 | MPEG-2 Audio File | Apple QuickTime Player | Apple |
| .MPE | Unknown Developer | 视频文件 | MPEG Movie | Apple QuickTime Player | Apple |
| .MPEG | Unknown Developer | 视频文件 | MPEG Movie | Apple QuickTime Player | Apple |
| .MPG | Moving Picture Experts Group | 视频文件 | MPEG Video File | Apple QuickTime Player | Apple |
| .MPG4 | Moving Picture Experts Group | 视频文件 | MPEG-4 Video File | Apple QuickTime Player | Apple |
| .MPV2 | Roxio | 视频文件 | MPEG-2 Video Stream | Apple QuickTime Player | Apple |
| .MQV | Sony | 视频文件 | Sony Movie Format File | Apple QuickTime Player | Apple |
| .MXF | SMPTE | 视频文件 | Material Exchange Format File | Apple QuickTime Player | Apple |
*不支持的文件可以使用二进制格式打开。
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