RemixIconEx.Document.file

You're seeing just the function file, go back to RemixIconEx.Document module for more information.
Link to this function

file(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Document.file()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M9 2.003V2h10.998C20.55 2 21 2.455 21 2.992v18.016a.993.993 0 0 1-.993.992H3.993A1 1 0 0 1 3 20.993V8l6-5.997zM5.83 8H9V4.83L5.83 8zM11 4v5a1 1 0 0 1-1 1H5v10h14V4h-8z" />
</svg>

example usage

svg.icon {
  width: 96;
  height: 96;
}