check MIME type

    public boolean check(File fileCheck) {
        try {
            Path filePath = FileSystems.getDefault().getPath(
                    fileCheck.getAbsolutePath());
            if ((Files.probeContentType(filePath) == null)) {
                return false;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return true;
    }
}