The video generated by the countCAM2 is in a MP4 format. When you connect your device to a computer through the supplied USB cable you will be able to review the video through any platform that can support MP4 video files.
If you are using the CountCAM2 Toolbox to compress/join your videos, or the countPRO software to review and process your videos, you will need to download and use VLC from the link below.