diff --git a/Tools/msi/merge.py b/Tools/msi/merge.py
deleted file mode 100644
index 568e622..0000000
--- a/Tools/msi/merge.py
+++ /dev/null
@@ -1,84 +0,0 @@
-import msilib,os,win32com,tempfile,sys
-PCBUILD="PCBuild"
-certname = None
-from config import *
-
-Win64 = "amd64" in PCBUILD
-
-mod_dir = os.path.join(os.environ["ProgramFiles"], "Common Files", "Merge Modules")
-msi = None
-if len(sys.argv)==2:
-    msi = sys.argv[1]
-if Win64:
-    modules = ["Microsoft_VC90_CRT_x86_x64.msm", "policy_9_0_Microsoft_VC90_CRT_x86_x64.msm"]
-    if not msi: msi = "python-%s.amd64.msi" % full_current_version
-else:
-    modules = ["Microsoft_VC90_CRT_x86.msm","policy_9_0_Microsoft_VC90_CRT_x86.msm"]
-    if not msi: msi = "python-%s.msi" % full_current_version
-for i, n in enumerate(modules):
-    modules[i] = os.path.join(mod_dir, n)
-
-def merge(msi, feature, rootdir, modules):
-    cab_and_filecount = []
-    # Step 1: Merge databases, extract cabfiles
-    m = msilib.MakeMerge2()
-    m.OpenLog("merge.log")
-    print "Opened Log"
-    m.OpenDatabase(msi)
-    print "Opened DB"
-    for module in modules:
-        print module
-        m.OpenModule(module,0)
-        print "Opened Module",module
-        m.Merge(feature, rootdir)
-        print "Errors:"
-        for e in m.Errors:
-            print e.Type, e.ModuleTable, e.DatabaseTable
-            print "   Modkeys:",
-            for s in e.ModuleKeys: print s,
-            print
-            print "   DBKeys:",
-            for s in e.DatabaseKeys: print s,
-            print
-        cabname = tempfile.mktemp(suffix=".cab")
-        m.ExtractCAB(cabname)
-        cab_and_filecount.append((cabname, len(m.ModuleFiles)))
-        m.CloseModule()
-    m.CloseDatabase(True)
-    m.CloseLog()
-
-    # Step 2: Add CAB files
-    i = msilib.MakeInstaller()
-    db = i.OpenDatabase(msi, win32com.client.constants.msiOpenDatabaseModeTransact)
-
-    v = db.OpenView("SELECT LastSequence FROM Media")
-    v.Execute(None)
-    maxmedia = -1
-    while 1:
-        r = v.Fetch()
-        if not r: break
-        seq = r.IntegerData(1)
-        if seq > maxmedia:
-            maxmedia = seq
-    print "Start of Media", maxmedia
-
-    for cabname, count in cab_and_filecount:
-        stream = "merged%d" % maxmedia
-        msilib.add_data(db, "Media",
-                [(maxmedia+1, maxmedia+count, None, "#"+stream, None, None)])
-        msilib.add_stream(db, stream,  cabname)
-        os.unlink(cabname)
-        maxmedia += count
-    # The merge module sets ALLUSERS to 1 in the property table.
-    # This is undesired; delete that
-    v = db.OpenView("DELETE FROM Property WHERE Property='ALLUSERS'")
-    v.Execute(None)
-    v.Close()
-    db.Commit()
-
-merge(msi, "SharedCRT", "TARGETDIR", modules)
-
-# certname (from config.py) should be (a substring of)
-# the certificate subject, e.g. "Python Software Foundation"
-if certname:
-    os.system('signtool sign /n "%s" /t http://timestamp.verisign.com/scripts/timestamp.dll %s' % (certname, msi))
diff --git a/Tools/msi/msi.py b/Tools/msi/msi.py
index 63b2399..a0d70de 100644
--- a/Tools/msi/msi.py
+++ b/Tools/msi/msi.py
@@ -7,6 +7,7 @@
 from win32com.client import constants
 from distutils.spawn import find_executable
 from uuids import product_codes
+import tempfile
 
 # Settings can be overridden in config.py below
 # 0 for official python.org releases
@@ -28,6 +29,8 @@
 PCBUILD="PCbuild"
 # msvcrt version
 MSVCR = "90"
+# Name of certificate in default store to sign MSI with
+certname = None
 
 try:
     from config import *
@@ -218,7 +221,8 @@
     # schema represents the installer 2.0 database schema.
     # sequence is the set of standard sequences
     # (ui/execute, admin/advt/install)
-    db = msilib.init_database("python-%s%s.msi" % (full_current_version, msilib.arch_ext),
+    msiname = "python-%s%s.msi" % (full_current_version, msilib.arch_ext)
+    db = msilib.init_database(msiname,
                   schema, ProductName="Python "+full_current_version+productsuffix,
                   ProductCode=product_code,
                   ProductVersion=current_version,
@@ -241,7 +245,7 @@
                               ("ProductLine", "Python%s%s" % (major, minor)),
                              ])
     db.Commit()
-    return db
+    return db, msiname
 
 def remove_old_versions(db):
     "Fill the upgrade table."
@@ -1293,7 +1297,7 @@
               ])
     db.Commit()
 
-db = build_database()
+db,msiname = build_database()
 try:
     add_features(db)
     add_ui(db)
@@ -1303,3 +1307,75 @@
     db.Commit()
 finally:
     del db
+
+# Merge CRT into MSI file. This requires the database to be closed.
+mod_dir = os.path.join(os.environ["ProgramFiles"], "Common Files", "Merge Modules")
+if msilib.Win64:
+    modules = ["Microsoft_VC90_CRT_x86_x64.msm", "policy_9_0_Microsoft_VC90_CRT_x86_x64.msm"]
+else:
+    modules = ["Microsoft_VC90_CRT_x86.msm","policy_9_0_Microsoft_VC90_CRT_x86.msm"]
+
+for i, n in enumerate(modules):
+    modules[i] = os.path.join(mod_dir, n)
+
+def merge(msi, feature, rootdir, modules):
+    cab_and_filecount = []
+    # Step 1: Merge databases, extract cabfiles
+    m = msilib.MakeMerge2()
+    m.OpenLog("merge.log")
+    m.OpenDatabase(msi)
+    for module in modules:
+        print module
+        m.OpenModule(module,0)
+        m.Merge(feature, rootdir)
+        print "Errors:"
+        for e in m.Errors:
+            print e.Type, e.ModuleTable, e.DatabaseTable
+            print "   Modkeys:",
+            for s in e.ModuleKeys: print s,
+            print
+            print "   DBKeys:",
+            for s in e.DatabaseKeys: print s,
+            print
+        cabname = tempfile.mktemp(suffix=".cab")
+        m.ExtractCAB(cabname)
+        cab_and_filecount.append((cabname, len(m.ModuleFiles)))
+        m.CloseModule()
+    m.CloseDatabase(True)
+    m.CloseLog()
+
+    # Step 2: Add CAB files
+    i = msilib.MakeInstaller()
+    db = i.OpenDatabase(msi, constants.msiOpenDatabaseModeTransact)
+
+    v = db.OpenView("SELECT LastSequence FROM Media")
+    v.Execute(None)
+    maxmedia = -1
+    while 1:
+        r = v.Fetch()
+        if not r: break
+        seq = r.IntegerData(1)
+        if seq > maxmedia:
+            maxmedia = seq
+    print "Start of Media", maxmedia
+
+    for cabname, count in cab_and_filecount:
+        stream = "merged%d" % maxmedia
+        msilib.add_data(db, "Media",
+                [(maxmedia+1, maxmedia+count, None, "#"+stream, None, None)])
+        msilib.add_stream(db, stream,  cabname)
+        os.unlink(cabname)
+        maxmedia += count
+    # The merge module sets ALLUSERS to 1 in the property table.
+    # This is undesired; delete that
+    v = db.OpenView("DELETE FROM Property WHERE Property='ALLUSERS'")
+    v.Execute(None)
+    v.Close()
+    db.Commit()
+
+merge(msiname, "SharedCRT", "TARGETDIR", modules)
+
+# certname (from config.py) should be (a substring of)
+# the certificate subject, e.g. "Python Software Foundation"
+if certname:
+    os.system('signtool sign /n "%s" /t http://timestamp.verisign.com/scripts/timestamp.dll %s' % (certname, msiname))