Proton/compatibilitytool.vdf.template

"compatibilitytools"
{
  "compat_tools"
  {
    "##BUILD_NAME##" // Internal name of this tool
    {
      // Can register this tool with Steam in two ways:
      //
      // - The tool can be placed as a subdirectory in compatibilitytools.d, in which case this
      //   should be '.'
      //
      // - This manifest can be placed directly in compatibilitytools.d, in which case this should
      //   be the relative or absolute path to the tool's dist directory.
      "install_path" "."

      // For this template, we're going to substitute the display_name key in here, e.g.:
      "display_name" "##BUILD_NAME##"

      "from_oslist"  "windows"
      "to_oslist"    "linux"
    }
  }
}