Menu button to open a "Open file dialog"?

I’m trying to get a menu button to trigger an “Open file dialog” when pressed but can’t figure it out. I see you need to have a script that does the open file dialog under Assets/Editor so can I have a class that does the open file dialog there and call that class from my script that will have the button the user will click on?

Thanks in advance.

Nevermind, I thought I had to have a seperate script do this for me but I can called the open file dialog from my mainmenu script.