code: static public void addKnownString(String mimeType, String knownString) {
  		Map<String,String> map = getKnownStrings();
  		if( null != mimeType && null != knownString ) {
  			map.put(knownString.trim(), mimeType.trim());
  		}
  	}
docs: Adds a relation between a known string for File and a mime type.
  @param mimeType Mime type that should be returned if known string is encountered
  @param knownString A string that is found when performing "file -bnk"