Calling File manager window?

I’m using Kodi 17.3 with Mac mini 2015 with latest macOS Sierra and a Logitech Harmony Ultimate.
I made some changes in customcontroller.Harmony.xml in my user map.
What I’m missing is being able to call the File Manager Window from every
where. Something like button id=”XXX”= ActivateWindow(Filemanager)
Is this possible or is there another solution?