Unfortunately, I have ONE video of my husband who recently fell off a ladder, had internal bleeding that couldn't be stopped and has passed away. I have downloaded that video from the camera to my WINDOWS XP. The file had a strange sequence of letters and numbers and I renamed it to something I would easily remember,{JOHN VIDEO }. The file does not have an extension. I have renamed the file JOHN VIDEO.avi, as someone had suggested. This was of no value. When I attempt to play the video, the Windows Media Player claims it does not recognize the codec used to compress the file. Does anyone out there have the knowledge to explain to me what I must do in order to view this video? Is there something I must purchase ? His two children are anxious to see it. I greatly appreciate your advice. Thank you.