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i was sent a mp4 and a m4v wetransfer video. After trying to open, my Macbook Air said "the file format isn't recognized". How do I resolve?

I was sent a mp4 and m4v weTransfer video file. After trying to open, my Macbook Air said, "the file format isn't recognized". How do I resolve?

MacBook Air, Mac OS X (10.7.5)

Posted on May 6, 2015 2:18 PM

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i was sent a mp4 and a m4v wetransfer video. After trying to open, my Macbook Air said "the file format isn't recognized". How do I resolve?

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