MVS problem.

Hello, i'm very sorry if this is not the good place to put this type of question, but I cannot find any other.
So, idk why, but whenever i double-click to open up like a example scene from a package, it opens it in MVS(microsoft visual studio). Or also when I try opening up the animator controller, it does the same thing, it opens up MVS. How can I stop this from happening? Thank you in advance.