Hello and welcome to Just Answer. My name is***** can help you with your question.
I understand that you are trying to play a Video that you recorded from your Nikon E5200 Coolpix Camera and somehow your computer can't play it or can't open it at all. In order for me to help you best, ***** ***** a bit more information:
- What type of computer do you have? Is it a Mac or PC?
- IF it is a Windows based machine, which Windows version is it running? Windows 7? Windows 8? Windows 10?