public static string FindFilePath(this ID id, string serializationFolderName)
        {
            lock (PathSets)
            {
                // find or create the set of paths for the serialization folder
                SerializedIdToPathSet pathSet;
                if (PathSets.ContainsKey(serializationFolderName))
                {
                    pathSet = PathSets[serializationFolderName];
                }
                else
                {
                    pathSet = new SerializedIdToPathSet();
                    var serializationFolder = Deserializer.GetSerializationFolder(serializationFolderName);

                    // Add filepaths for shortened paths
                    foreach (
                        var shortenedItemsFolder in ShortenedPathsDictionary.GetLocationsFromLinkFiles(serializationFolder).Values)
                    {
                        pathSet.FilePaths.Push(shortenedItemsFolder);
                    }

                    // Add filepath for root of regular content
                    pathSet.FilePaths.Push(serializationFolder.FullName);

                    PathSets.Add(serializationFolderName, pathSet);
                }

                // get the individual item if already found
                if (pathSet.Paths.ContainsKey(id))
                {
                    return(pathSet.Paths[id]);
                }

                while (pathSet.FilePaths.Any())
                {
                    var filePath = pathSet.FilePaths.Pop();
                    foreach (var subdirectory in Directory.GetDirectories(filePath))
                    {
                        pathSet.FilePaths.Push(subdirectory);
                    }

                    string foundFile = null;
                    foreach (var file in Directory.GetFiles(filePath, "*.item"))
                    {
                        using (var sr = new StreamReader(file))
                        {
                            sr.ReadLine();
                            sr.ReadLine();
                            var itemIdStr = sr.ReadLine().Substring(4);
                            if (!ID.IsID(itemIdStr))
                            {
                                continue;
                            }

                            var itemId = ID.Parse(itemIdStr);
                            if (pathSet.Paths.ContainsKey(itemId))
                            {
                                throw new DuplicateIdException(itemId, file, pathSet.Paths[itemId]);
                            }

                            pathSet.Paths.Add(itemId, file);
                            if (itemId == id)
                            {
                                foundFile = file;
                            }
                        }
                    }

                    if (foundFile != null)
                    {
                        return(foundFile);
                    }
                }

                return(null);
            }
        }
    public static string FindFilePath(this ID id, string serializationFolderName)
    {
      lock (PathSets)
      {
        // find or create the set of paths for the serialization folder
        SerializedIdToPathSet pathSet;
        if (PathSets.ContainsKey(serializationFolderName))
        {
          pathSet = PathSets[serializationFolderName];
        }
        else
        {
          pathSet = new SerializedIdToPathSet();
          var serializationFolder = Deserializer.GetSerializationFolder(serializationFolderName);

          // Add filepaths for shortened paths
          foreach (
            var shortenedItemsFolder in ShortenedPathsDictionary.GetLocationsFromLinkFiles(serializationFolder).Values)
          {
            pathSet.FilePaths.Push(shortenedItemsFolder);
          }

          // Add filepath for root of regular content
          pathSet.FilePaths.Push(serializationFolder.FullName);

          PathSets.Add(serializationFolderName, pathSet);
        }

        // get the individual item if already found
        if (pathSet.Paths.ContainsKey(id))
        {
          return pathSet.Paths[id];
        }

        while (pathSet.FilePaths.Any())
        {
          var filePath = pathSet.FilePaths.Pop();
          foreach (var subdirectory in Directory.GetDirectories(filePath))
          {
            pathSet.FilePaths.Push(subdirectory);
          }

          string foundFile = null;
          foreach (var file in Directory.GetFiles(filePath, "*.item"))
          {
            using (var sr = new StreamReader(file))
            {
              sr.ReadLine();
              sr.ReadLine();
              var itemIdStr = sr.ReadLine().Substring(4);
              if (!ID.IsID(itemIdStr))
              {
                continue;
              }

              var itemId = ID.Parse(itemIdStr);
              pathSet.Paths.Add(itemId, file);
              if (itemId == id)
              {
                foundFile = file;
              }
            }
          }

          if (foundFile != null)
          {
            return foundFile;
          }
        }

        return null;
      }
    }