5n confused user
I believe (someone correct me if I'm wrong) it saves them as either .mts or .mp4 files depending on your settings. Are you looking to just play them on your computer, or edit them? If you want to just play them, I find vlc ( http://www.videolan.org/vlc/ ) works perfectly for my .mts files. A lot of video editing software won't recognise .mts files off the bat but there are plug ins and other work arounds to get them working.