After you connect the camera to your PC, launch the ZoomBrowser EX software, and wait for the program to recognize the device. You will be able to see all the files from your camera in the right pane. You can open them by double-clicking on their thumbnails or you can edit them if you select Edit Movie from the Edit menu:
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For further details access the official web page and open the video tutorial from the Creative Video Editing with Canon Software section.