public void addEntry(Card c, String set) {
		String key = c.getFileName();
		String value = map.get(key);
		
		if(value == null) {
			map.put(key, set);
			try {
				// Append new set to file
				FileUtilities.fixDirs(indexFile);
				FileWriter pw = new FileWriter(indexFile, true);
				pw.write(key + "\t" + set  + "\n");
				pw.close();			
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}