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i can not open the email with file format MPEG_4(mp4) which is one of the contents on the file format listing , supporting by Quick time player but still can not be opened . !!!!!!!!! by the way my quick time player version:10.2(603.6)
iMac (21.5-inch Late 2009), OS X Mountain Lion (10.8.2)
The file extension, .mp4, .wmv, .mov, etc. really has no bearing on whether it can play or not. It should, but that is not the way it works. The file type is merely a wrapper around the media content. That media content can be encoded with lots of different encoding algorithms. If it is encoded with a scheme that Quicktime doesn't understand, then it won't play in Quicktime Player.
You might try installing the Perian plugin for Quicktime. It might have the codecs necessary to decode the media content.
Another option is to use Video LAN's VLC. It plays a lot of things.
AS Barney suggested Perian is a good start. Also download and try QuickTime Player 7 for Mac OS X v10.6.3 or later.
OT
why can i not open the file format MPEG_4(mp4) on my mac with Quick player?
