Possible Call File Script

I'm not quite sure if Ed has written this already, but I came up with a short script to call a new file. I just cant seem to get the file to execute once selected.

proc int onOpen(string $filename,string $type) {

  print($filename+"\n");

  print($type+"\n");

  return true;

}

fileBrowser( "onOpen", "Open", "", 0 );