xhr.open('GET', 'emulators/dosbox/dosbox.wasm')
      xhr.responseType = 'arraybuffer';
      xhr.addEventListener('load', function(ev) {
        console.log('loaded!', ev);
        var code = xhr.response;
        runExecutable('win.bat', code);
      });
      xhr.send();

      function runExecutable(exe, code) {
        var emulator = new Emulator(canvas,
          null,
          new DosBoxLoader(
            DosBoxLoader.emulatorJS("emulators/dosbox/dosbox.wasm.js"),
            DosBoxLoader.locateAdditionalEmulatorJS(function() { return "emulators/dosbox/dosbox.html.mem"; }),
            DosBoxLoader.nativeResolution(1024, 1024),
            DosBoxLoader.mountZip("c", DosBoxLoader.fetchFile("Game File", "systems/ibmpc/win311.zip")),
            DosBoxLoader.startExe(exe)
          )
        );
        emulator.setCallbacks({
          before_emulator: function() {
            Module.wasmBinary = code;
          }
        })
      }