Video file wont open. "Invalid Name"?

ok so I'm trying to play a video file and every time I try to open it it says %26quot;Invalid file name%26quot; so I tried to change the name and it wont let me change it. Any idea on how to fix this?Video file wont open. %26quot;Invalid Name%26quot;?Not enough information. What's the full name of the file (including the extension)? What program are you trying to open it with?