What should be done in the registry so that Excel opens instead of Word and vice versa?

Question

Windows Registry

I am a 1st year student. We were given tasks on the topic of chips in the registry, but there is nothing on the Internet on these topics. Help me please! Thanks in advance!
This is not the only task, there are more 5)
I would be very happy with any answer!)

Answer 1

Making fun of colleagues?
Well, as an option - change the labels.