Looks like Root is a number variable, but it should be a text variable! Double click it and change that in the drop-down menu.
Also you might want to add more than just "C:\" but it depends...For example, if my project folder was on my desktop I would set Root, in preview, to "C:" & NodeWebkit.UserFolder & "Desktop\Project\"
You might want to set a text object to Root to see exactly what it returns (or check it in the debugger) then look in that path to see if the file was created or not.
I just changed the root variable to text. The file is created now, but it still isn't loading properly. In my list above, point number 5 still plays the sound for key "one" <=0. However, when opening the file in notepad, it says this: "c2dictionary":true,"data":{"one":2}}
So it kinda looks like key "one" is being saved (it probably equals 2 because I pressed L two times), but isn't being loaded.