some kind of DVR sample file not zipped. http://www.ildvrusa.com/h264samples.htm To play the above samples, please http://www.ildvrusa.com/download/player_4_window.rar 1. Click to download the "H.264 player". This player allows you to play the .mp4 files direct from a CD/DVD/Memory stick without the need for any installation. Download and unzip the player, open it up. 2. Download the sample files that has the file type ".zip". Change the file type from *.zip to *.mp4 (you do not need to unzip them). 3. Use the player to play these files. The video will play with audio and can be expanded to 200% or even full screen. The 840MB.mp4 gives you DVD quality. Please contact us if you cannot play these files.