private boolean verifyHTMLContent(File file) {
		BufferedReader reader = null;
		boolean valid = true;
		try {
			reader = new BufferedReader(new FileReader(file));
			String line;
			while ((line = reader.readLine()) != null) {
				if (line.contains("content=\"text/html;charset=utf-8\"")) {
					valid = false;
				} else if (line.contains("html lang=\"en\"")) {
					valid = false;
				} else if (line.contains("<html>")) {
					valid = false;
				}
			}
		} catch (EOFException ignored) {
		} catch (FileNotFoundException e) {
			plugin.printStackTrace(e);
		} catch (IOException e) {
			plugin.printStackTrace(e);
		}

		if (reader != null) {
			try {
				reader.close();
			} catch (IOException e) {
				plugin.printStackTrace(e);
			}
		}
		return valid;
	}