DVD player is compitable for playing VCD,MPEG,JPEG,DVD,mp3,mp4-files
You can mp3 files from a cd, USB drives and SD cards on this model.
You might have damage files or you need a certain kind of codec for those files. KLite is free and it works in 99%.
Usually is mp4 files do not play correctly there is either something wrong with original file, the device it is saved on, or the system that is trying to read the file.
yes it does but you have to enable the "wma playback"you can find that in system settings
They tie you to your TV at home. It limit your devices to play different formats of files.
Experimental
Yes, PDA's will play music files.
I am glad to say that, yes, it will. If the video player built-into the android operating system does not open AVI files, there is a lot of video players on the android market and I am positive that many of them play AVI files.
what kinds of problems do you watch for at home and at play
Yes. It should play downloaded MP4 files.
Yes VLC media player will play .m4v files.
No you do not need special software to purchase music but you will need the right kind of software to play the files.