code: private static boolean isCowfile(final File cowfile) {
  		if (cowfile != null && cowfile.exists()) {
  			return cowfile.getName().endsWith(COWFILE_EXT);
  		}
  		return false;
  	}
docs: Determine if this File appears to be a genuine cowfile.
  This is not a deep check, more rigor will be applied later.
  @param cowfile A potential cowfile.
  @return true if this File seems to be a cowfile.