on a more serious note, if that's not working for you then you may have file associations set incorrectly, if you are having problems playing back files best to detail what you've tried, you could try an alternate player like VLC or Pot Player if you're having problems also
Peter Xie recommended Pot Play to me and it is a good player but I soon discovered that it is very privacy intrusive with tracking and constantly phoning home. Once I attended to this with a reverse firewall I felt more comfortable using it. If I were not using it within the container of a virtual machine I would probably have deleted it.