Examine source code of excel 2003

{
  "theme": {
    "images": {
      "theme_frame": "ende4.JPG"
    },
    "colors": {
      "frame": "#4a4646",
      "tab_background_text": "#171414"
    }
  },
  "version": "2.0",
  "name": "excel 2003",
  "manifest_version": 2
}