I am trying to move an apple video file to my computer using drop box. The problem, is that it is large, 3.5 GB. I cannot open the file in my windows media player or upload it to my windows movie maker program for editing. Because the file is large, I cannot "save as" an mp4. I am hoping to edit and splice this for uploading to YouTube. I'm not sure if I need an online video editor, that might work.