HT3775 My file is an mp4 and it still won't open in quicktime

any suggestions?

What happens when you try to open it, do you get any message?
Choose that file and "Get Info" (cmd-i). Under the Open with section, which application is chosen to open the file?
Choose QT and try again.
It's also possible that the file is corrupt. Do other mp4 files open normally?

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