Display items depending on whether a file exists in a specific folder, and to create/delete the file depending on what the button is set to

Question

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The file that needs to be created when the button is clicked while being displayed as a red face is testing.dat in the folder %AppData%/CVN All Access/watchlist, the folder should be created if it doesn't exist. Likewise, the testing.dat should be deleted if the face is green and is clicked (the folder %AppData%/CVN All Access/watchlist should remain though).

Pretty much every solution I could find is too complex and/or doesn't work. My problem recommends a simple and easy-to-understand solution.

If the folder name %AppData% cannot be used in JavaScript, maybe use C:/CVN All Access/watchlist as the destination instead.