diff --git a/Doc/library/_winreg.rst b/Doc/library/_winreg.rst
index 7a5aa38..2544b5a 100644
--- a/Doc/library/_winreg.rst
+++ b/Doc/library/_winreg.rst
@@ -133,6 +133,16 @@
    +-------+--------------------------------------------+
 
 
+.. function:: ExpandEnvironmentStrings(unicode)
+
+   Expands environment strings %NAME% in unicode string like const:`REG_EXPAND_SZ`::
+   
+   >>> ExpandEnvironmentStrings(u"%windir%")
+   u"C:\\Windows"
+   
+   .. versionadded: 2.6
+
+
 .. function:: FlushKey(key)
 
    Writes all the attributes of a key to the registry.
@@ -418,3 +428,11 @@
    handle is not closed.  You would call this function when  you need the
    underlying Win32 handle to exist beyond the lifetime  of the handle object.
 
+.. method:: PyHKEY.__enter__()
+.. method:: PyHKEY.__exit__(*exc_info)
+   
+   The HKEY object implements __enter__ and __exit__ and thus supports the 
+   context protocol for the with statement.
+   
+   .. versionadded: 2.6
+
diff --git a/Lib/test/test_winreg.py b/Lib/test/test_winreg.py
index 85a0aac..f2ec2a8 100644
--- a/Lib/test/test_winreg.py
+++ b/Lib/test/test_winreg.py
@@ -80,26 +80,26 @@
 
         key = OpenKey(root_key, test_key_name)
         # Read the sub-keys
-        sub_key = OpenKey(key, "sub_key")
-        # Check I can enumerate over the values.
-        index = 0
-        while 1:
-            try:
-                data = EnumValue(sub_key, index)
-            except EnvironmentError:
-                break
-            self.assertEquals(data in test_data, True,
-                              "Didn't read back the correct test data")
-            index = index + 1
-        self.assertEquals(index, len(test_data),
-                          "Didn't read the correct number of items")
-        # Check I can directly access each item
-        for value_name, value_data, value_type in test_data:
-            read_val, read_typ = QueryValueEx(sub_key, value_name)
-            self.assertEquals(read_val, value_data,
-                              "Could not directly read the value")
-            self.assertEquals(read_typ, value_type,
-                              "Could not directly read the value")
+        with OpenKey(key, "sub_key") as sub_key:
+            # Check I can enumerate over the values.
+            index = 0
+            while 1:
+                try:
+                    data = EnumValue(sub_key, index)
+                except EnvironmentError:
+                    break
+                self.assertEquals(data in test_data, True,
+                                  "Didn't read back the correct test data")
+                index = index + 1
+            self.assertEquals(index, len(test_data),
+                              "Didn't read the correct number of items")
+            # Check I can directly access each item
+            for value_name, value_data, value_type in test_data:
+                read_val, read_typ = QueryValueEx(sub_key, value_name)
+                self.assertEquals(read_val, value_data,
+                                  "Could not directly read the value")
+                self.assertEquals(read_typ, value_type,
+                                  "Could not directly read the value")
         sub_key.Close()
         # Enumerate our main key.
         read_val = EnumKey(key, 0)
@@ -161,6 +161,11 @@
         remote_key = ConnectRegistry(self.remote_name, HKEY_CURRENT_USER)
         self.TestAll(remote_key)
 
+    def testExpandEnvironmentStrings(self):
+        r = ExpandEnvironmentStrings(u"%windir%\\test")
+        self.assertEqual(type(r), unicode)
+        self.assertEqual(r, os.environ["windir"] + "\\test")
+
 def test_main():
     test_support.run_unittest(WinregTests)
 
diff --git a/Misc/NEWS b/Misc/NEWS
index e1745a7..c77ce62 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -944,6 +944,10 @@
 Extension Modules
 -----------------
 
+- _winreg's HKEY object have gained __enter__ and __exit__ functions to support he
+  context manager protocol. The _winreg module also got a new function
+  ``ExpandEnvironmentStrings`` to expand REG_EXPAND_SZ keys.
+
 - Issue #1646: Make socket support TIPC. The socket module now has support
   for TIPC under Linux, see http://tipc.sf.net/ for more information.
 
diff --git a/PC/_winreg.c b/PC/_winreg.c
index 9ddbb23..19f928e 100644
--- a/PC/_winreg.c
+++ b/PC/_winreg.c
@@ -47,6 +47,7 @@
 "DeleteValue() - Removes a named value from the specified registry key.\n"
 "EnumKey() - Enumerates subkeys of the specified open registry key.\n"
 "EnumValue() - Enumerates values of the specified open registry key.\n"
+"ExpandEnvironmentStrings() - Expand the env strings in a REG_EXPAND_SZ string.\n"
 "FlushKey() - Writes all the attributes of the specified key to the registry.\n"
 "LoadKey() - Creates a subkey under HKEY_USER or HKEY_LOCAL_MACHINE and stores\n"
 "            registration information from a specified file into that subkey.\n"
@@ -146,6 +147,9 @@
 " on the underlying registry type.\n"
 "data_type is an integer that identifies the type of the value data.");
 
+PyDoc_STRVAR(ExpandEnvironmentStrings_doc,
+"string = ExpandEnvironmentStrings(string) - Expand environment vars.\n");
+
 PyDoc_STRVAR(FlushKey_doc,
 "FlushKey(key) - Writes all the attributes of a key to the registry.\n"
 "\n"
@@ -518,9 +522,27 @@
 	return PyLong_FromVoidPtr(ret);
 }
 
+static PyObject *
+PyHKEY_Enter(PyObject *self)
+{
+	Py_XINCREF(self);
+	return self;
+}
+
+static PyObject *
+PyHKEY_Exit(PyObject *self, PyObject *args)
+{
+	if (!PyHKEY_Close(self))
+		return NULL;
+	Py_RETURN_NONE;
+}
+
+
 static struct PyMethodDef PyHKEY_methods[] = {
 	{"Close",  PyHKEY_CloseMethod, METH_VARARGS, PyHKEY_Close_doc},
 	{"Detach", PyHKEY_DetachMethod, METH_VARARGS, PyHKEY_Detach_doc},
+	{"__enter__", (PyCFunction)PyHKEY_Enter, METH_NOARGS, NULL},
+	{"__exit__", PyHKEY_Exit, METH_VARARGS, NULL},
 	{NULL}
 };
 
@@ -1118,6 +1140,39 @@
 }
 
 static PyObject *
+PyExpandEnvironmentStrings(PyObject *self, PyObject *args)
+{
+	Py_UNICODE *retValue = NULL;
+	Py_UNICODE *src;
+	DWORD retValueSize;
+	DWORD rc;
+	PyObject *o;
+
+	if (!PyArg_ParseTuple(args, "u:ExpandEnvironmentStrings", &src))
+		return NULL;
+
+	retValueSize = ExpandEnvironmentStringsW(src, retValue, 0);
+	if (retValueSize == 0) {
+		return PyErr_SetFromWindowsErrWithFunction(retValueSize,
+						"ExpandEnvironmentStrings");
+	}
+	retValue = (Py_UNICODE *)PyMem_Malloc(retValueSize * sizeof(Py_UNICODE));
+	if (retValue == NULL) {
+		return PyErr_NoMemory();
+	}
+
+	rc = ExpandEnvironmentStringsW(src, retValue, retValueSize);
+	if (rc == 0) {
+		PyMem_Free(retValue);
+		return PyErr_SetFromWindowsErrWithFunction(retValueSize,
+						"ExpandEnvironmentStrings");
+	}
+	o = PyUnicode_FromUnicode(retValue, wcslen(retValue));
+	PyMem_Free(retValue);
+	return o;
+}
+
+static PyObject *
 PyFlushKey(PyObject *self, PyObject *args)
 {
 	HKEY hKey;
@@ -1412,6 +1467,8 @@
 	{"DeleteValue",      PyDeleteValue,     METH_VARARGS, DeleteValue_doc},
 	{"EnumKey",          PyEnumKey,         METH_VARARGS, EnumKey_doc},
 	{"EnumValue",        PyEnumValue,       METH_VARARGS, EnumValue_doc},
+	{"ExpandEnvironmentStrings", PyExpandEnvironmentStrings, METH_VARARGS,
+		ExpandEnvironmentStrings_doc },
 	{"FlushKey",         PyFlushKey,        METH_VARARGS, FlushKey_doc},
 	{"LoadKey",          PyLoadKey,         METH_VARARGS, LoadKey_doc},
 	{"OpenKey",          PyOpenKey,         METH_VARARGS, OpenKey_doc},