Videos I record show up with audio only on computer but work on phone, what could the problem be?

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AC Question

Videos I record show up with audio only on computer but work on phone

I recorded videos on my HTC one and they show up fine when I view them on my phone--audio and video all work. When I plugged in the phone to my computer and open the phone (as "removable disk I")they only play the audio in a black box. I copied and pasted the file onto the desktop and still no visual. Other videos I've recorded work fine. These are all quite large--over 25 megs, could that have something to do with it?