How can I determine who created a type of computer file, such as jpegs and .mov files?

I have received some anonymous emails containing jpgs, tiffs and mov files. Is there any way to learn or figure out who made them? Is there a computer serial # or something that gets logged onto each file? If I have to contact the police, will they be able to tell me the name of the computer or anything besides the ip address of the email’s sender?