Examine source code of locomotion.steam

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#c8c8c8",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "locomotion.steam",
  "manifest_version": 2,
  "description": "Part of steam engine of a German BR 64, own photo"
}