# Buggy code
def Open(self, path=None, read_only=True, **unused_kwargs):
    """Opens the storage.

    Args:
      path (Optional[str]): path of the storage file.
      read_only (Optional[bool]): True if the file should be opened in
          read-only mode.

    Raises:
      IOError: if the storage file is already opened.
      ValueError: if path is missing.
    """
    if self._is_open:
        raise IOError("Storage file already opened.")

    if not path:
        raise ValueError("Missing path.")

    if read_only:
        access_mode = "rb"
    else:
        access_mode = "wb"

    self._gzip_file = gzip.open(path, access_mode, self._COMPRESSION_LEVEL)

    if read_only:
        self._OpenRead()

    self._is_open = True
    self._read_only = read_only


# Traceback (WindowsError)
(plaso) C:\dev\plaso>python tools\psort.py -o xlsx G:\test_data\set_1_output.zip -w G:\test_data\set_1_output.xlsx --status_view none -d --analysis browser_search
2016-08-30 12:37:21,882 [INFO] (MainProcess) PID:9376 <psort> Starting analysis plugins.
2016-08-30 12:37:21,888 [DEBUG] (MainProcess) PID:9376 <zeromq_queue> Creating socket for browser_search output event queue
2016-08-30 12:37:21,898 [DEBUG] (MainProcess) PID:9376 <zeromq_queue> browser_search output event queue bound to random port 61649
2016-08-30 12:37:22,417 [INFO] (MainProcess) PID:9376 <psort> Started analysis plugin: browser_search (PID: 14200).
2016-08-30 12:37:24,822 [INFO] (MainProcess) PID:9376 <psort> Analysis plugins running
Traceback (most recent call last):
File "tools\psort.py", line 867, in <module>
if not Main():
File "tools\psort.py", line 853, in Main
tool.ProcessStorage()
File "tools\psort.py", line 787, in ProcessStorage
status_update_callback=status_update_callback)
File "C:\dev\plaso\plaso\frontend\psort.py", line 103, in AnalyzeEvents
status_update_callback=status_update_callback)
File "C:\dev\plaso\plaso\multi_processing\psort.py", line 536, in AnalyzeEvents
storage_writer.Open()
File "C:\dev\plaso\plaso\storage\zip_file.py", line 3217, in Open
self._storage_file.Open(path=self._output_file, read_only=False)
File "C:\dev\plaso\plaso\storage\zip_file.py", line 2754, in Open
self._OpenZIPFile(path, read_only)
File "C:\dev\plaso\plaso\storage\zip_file.py", line 1740, in _OpenZIPFile
os.rename(path, zipfile_path)
WindowsError: [Error 32] The process cannot access the file because it is being used by another process

# Fixed code
def Open(self, path=None, read_only=True, **unused_kwargs):
    """Opens the storage.

    Args:
      path (Optional[str]): path of the storage file.
      read_only (Optional[bool]): True if the file should be opened in
          read-only mode.

    Raises:
      IOError: if the storage file is already opened.
      ValueError: if path is missing.
    """
    if self._is_open:
        raise IOError("Storage file already opened.")

    if not path:
        raise ValueError("Missing path.")

    if read_only:
        access_mode = "rb"
    else:
        access_mode = "wb"

    self._gzip_file = gzip.open(path, access_mode, self._COMPRESSION_LEVEL)
    if platform_specific.PlatformIsWindows():
        file_handle = self._gzip_file.fileno()
        platform_specific.DisableWindowsFileHandleInheritance(file_handle)
    if read_only:
        self._OpenRead()

    self._is_open = True
    self._read_only = read_only