.mp4 files no longer open as movies

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All of a sudden .mp4 files are loading in Sound Studio instead of DVD Player. What can I do to restore the way it worked until a few days ago. If I am not posting this in the right place, please enlighten me. Phil
 
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It would seem like the Default "Open with" option is Sound Studio for .mp4 files. Here is a way to change it:

http://www.howtogeek.com/howto/4253...ault-application-for-a-file-type-in-mac-os-x/

If you also click Change All, that will change it for all .mp4 files (once you confirm it).

I just did that on Season 1 of the TV Series The Americans. All the .mkc files originally would be opened with DivX Player. But, I changed one of them to open with VLC, clicked Change All, got a dialogue asking me to confirm that I wanted the change to apply to all .mkc files, and clicked OK. It worked perfectly. (I also did it with a .mp4 file for Season 2 of that same series, and it worked).
 
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I have tried Open With and Change All. DVD Playere would not recognize the .mp4 files.

Anyone else have an idea? Phil
 

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