Some images on commons.wikimedia have converted the file format to other formats. For example the SVG file https://commons.wikimedia.org/wiki/File:Codabar-example.svg has png formats available (https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Codabar-example.svg/705px-Codabar-example.svg.png)
I can get the url of the SVG file using page.fileUrl(), but there doesnt seem to be a method to get the URL of the png files.