diff --git a/Tools/msi/msi.py b/Tools/msi/msi.py
--- a/Tools/msi/msi.py
+++ b/Tools/msi/msi.py
@@ -448,6 +448,10 @@
               ("SetDLLDirToTarget", 'DLLDIR=""', 751),
              ])
 
+    # Prepend TARGETDIR to the system path, and remove it on uninstall.
+    add_data(db, "Environment",
+             [("PathAddition", "=-*Path", "[TARGETDIR];[~]", "REGISTRY.path")])
+
     # Execute Sequences
     add_data(db, "InstallExecuteSequence",
             [("InitialTargetDir", 'TARGETDIR=""', 750),
@@ -829,7 +833,7 @@
     # (i.e. additional Python libraries) need to follow the parent feature.
     # Features that have no advertisement trigger (e.g. the test suite)
     # must not support advertisement
-    global default_feature, tcltk, htmlfiles, tools, testsuite, ext_feature, private_crt
+    global default_feature, tcltk, htmlfiles, tools, testsuite, ext_feature, private_crt, prepend_path
     default_feature = Feature(db, "DefaultFeature", "Python",
                               "Python Interpreter and Libraries",
                               1, directory = "TARGETDIR")
@@ -854,6 +858,13 @@
     testsuite = Feature(db, "Testsuite", "Test suite",
                         "Python test suite (Lib/test/)", 11,
                         parent = default_feature, attributes=2|8)
+    # prepend_path is an additional feature which is to be off by default.
+    # Since the default level for the above features is 1, this needs to be
+    # at least level higher.
+    prepend_path = Feature(db, "PrependPath", "Prepend Path",
+                        "Prepend [TARGETDIR] to the system Path", 12,
+                        parent = default_feature, attributes=2|8,
+                        level=2)
 
 def extract_msvcr90():
     # Find the redistributable files
@@ -1192,6 +1203,8 @@
                "InstallPath"),
               ("REGISTRY.doc", msilib.gen_uuid(), "TARGETDIR", registry_component, None,
                "Documentation"),
+              ("REGISTRY.path", msilib.gen_uuid(), "TARGETDIR", registry_component, None,
+              None), 
               ("REGISTRY.def", msilib.gen_uuid(), "TARGETDIR", registry_component,
                None, None)] + tcldata)
     # See "FeatureComponents Table".
@@ -1208,6 +1221,7 @@
     add_data(db, "FeatureComponents",
              [(default_feature.id, "REGISTRY"),
               (htmlfiles.id, "REGISTRY.doc"),
+              (prepend_path.id, "REGISTRY.path"),
               (ext_feature.id, "REGISTRY.def")] +
               tcldata
               )