We haven't shot with our Canon 5D Mark IIIs for a while but I took one out the other day and when I came back the files didn't show up on the desktop when I put the card in the card reader. I played the files back in the camera so I knew they recorded. I had to capture the files straight from the camera. When I brought them into my computer I saw they were .m2v (mp4?) and not .mov. Someone must have taken the camera out and changed a setting but I can't find anything in the menu that would even allow you to switch from .mov to .m2v. I can't find anything on the web about this either. Does anyone know how to fix this? The camera is set for 1920/24 All-I. Thank you.