Can I put all three of these types of files on an Ipod or play them in a DVD player and they will just play just as if they are Mp3's?

Or should I always keep the same format for my devices? When I am using them on my computer, the m4a's seem to want to play in my Winamp and the other two will open up in Windows Media player.

So what's the best? I wouldn't want to put a mixed media on a CD then have it stop on a song that is a different format so I will have wasted the copy.
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