code: private static File[] getCowFiles(final String folder) {
  		File dir = new File(folder);
  		File[] files;
  		files = dir.listFiles(new FilenameFilter() {
  			@Override
  			public boolean accept(final File dir, final String name) {
  				return name.endsWith(".cow");
  			}
  		});
  		return files;
  	}
docs: Gets all cowfiles found in the given directory.
  @param folder The absolute path to the filesystem folder.
  @return A list of all cowfiles found in this directory.