Now I trying to work directly with zodb. I am using python 2.2.3 and have downloaded theses versions of standalone zodb: ZODB3-3.1.win32-py2.1.exe ZODB3-3.1.win32-py2.2.exe ZODB3-3.2b2.win32-py2.2.exe But when I try this script: ////////////////////// from ZODB import FileStorage, DB storage = FileStorage.FileStorage('c:\\database\\var\\data.fs') db = DB(storage) connection = db.open() root = connection.root() employees = root['employees'] for employee in employees: print employee.name ////////////////////////////////// This error message "No module named BTree" is displayed: Traceback (most recent call last): File "zodb.py", line 7, in ? employees = root['employees'] File "D:\APP\PYTHON\lib\UserDict.py", line 14, in __getitem__ def __getitem__(self, key): return self.data[key] File "D:\APP\PYTHON\Lib\site-packages\ZODB\Connection.py", line 566, in setstate self._set_ghost_state(obj, p) File "D:\APP\PYTHON\Lib\site-packages\ZODB\Connection.py", line 605, in _set_ghost_state state = unpickler.load() File "D:\APP\PYTHON\Lib\site-packages\ZODB\Connection.py", line 203, in _persistent_load return self[oid] File "D:\APP\PYTHON\Lib\site-packages\ZODB\Connection.py", line 163, in __getitem__ klass=self._db._classFactory(self, module, name) File "D:\APP\PYTHON\lib\site-packages\ZODB\DB.py", line 126, in _classFactory return getattr(__import__(location, _globals, _globals, _silly),name) ImportError: No module named BTree Which version of standalone zodb I need to install for this BTree module to be available. --Sukhwinder Singh