Monodevelop default compilator

Well, I've had this problem since I installed the newest version of Unity. Whenever I create a C# script, it opens Visual Studios and not Monodevelop. What are the steps to set Monodevelop as my default compilator? (if this is the right way to say ). Note: I've already installed Xamarin Studios in my PC

And if possible, I don't want to get rid of Visual Studios