Yes. I would probably use.
Nodewebkit Path doesn't exist => Create Folder NodeWebkit.UserFolder&"Documents/1Ultimate Game"
Then just write file.
Path = NodeWebkit.UserFolder&"Documents/1Ultimate Game/Config"
Content = Whatever but, note that for some reason if you just try to save plain text from text plugin or textbox I get some weird results. So it would be good to save as JSON.
Haven't tested all the functionality but, there should't be much else to it.
As you see from the list on functions that it indeed can move files etc. and even detect dropped files.
Use debugger to check what NW is actually doing if you run into problems.
Edit:Make sure you preview as Node-Webkit!