Index: Lib/distutils/msvc9compiler.py
===================================================================
--- Lib/distutils/msvc9compiler.py	(revision 83863)
+++ Lib/distutils/msvc9compiler.py	(working copy)
@@ -24,6 +24,7 @@
 from distutils.ccompiler import CCompiler, gen_lib_options
 from distutils import log
 from distutils.util import get_platform
+from distutils.spawn import find_executable
 
 import _winreg
 
@@ -320,11 +321,13 @@
     _cpp_extensions = ['.cc', '.cpp', '.cxx']
     _rc_extensions = ['.rc']
     _mc_extensions = ['.mc']
+    _asm_extensions = ['.asm']
 
     # Needed for the filename generation methods provided by the
     # base class, CCompiler.
     src_extensions = (_c_extensions + _cpp_extensions +
-                      _rc_extensions + _mc_extensions)
+                      _rc_extensions + _mc_extensions +
+                      _asm_extensions)
     res_extension = '.res'
     obj_extension = '.obj'
     static_lib_extension = '.lib'
@@ -354,6 +357,13 @@
             raise DistutilsPlatformError("--plat-name must be one of %s" %
                                          (ok_plats,))
 
+        # Will succeed if the user has already executed vcvarsall.
+        self.ml = None
+        if find_executable("ml64.exe"):
+            self.ml = "ml64.exe"
+        elif find_executable("ml.exe"):
+            self.ml = "ml.exe"
+
         if "DISTUTILS_USE_SDK" in os.environ and "MSSdk" in os.environ and self.find_exe("cl.exe"):
             # Assume that the SDK set up everything alright; don't try to be
             # smarter
@@ -406,6 +416,13 @@
         self.__paths = normalize_and_reduce_paths(self.__paths)
         os.environ['path'] = ";".join(self.__paths)
 
+        # Try again with new path:
+        if not self.ml: 
+            if self.find_exe("ml64.exe"):
+                self.ml = "ml64.exe"
+            elif self.find_exe("ml.exe"):
+                self.ml = "ml.exe"
+
         self.preprocess_options = None
         if self.__arch == "x86":
             self.compile_options = [ '/nologo', '/Ox', '/MD', '/W3',
@@ -530,6 +547,13 @@
                 except DistutilsExecError, msg:
                     raise CompileError(msg)
                 continue
+            elif ext in self._asm_extensions:
+                try:
+                    output_obj = '/Fo' + obj
+                    self.spawn([self.ml] + ['/c', '/Cx', output_obj] + [src])
+                except DistutilsExecError as msg:
+                    raise CompileError(msg)
+                continue
             else:
                 # how to handle this file?
                 raise CompileError("Don't know how to compile %s to %s"
Index: Lib/distutils/tests/test_msvc9compiler.py
===================================================================
--- Lib/distutils/tests/test_msvc9compiler.py	(revision 83863)
+++ Lib/distutils/tests/test_msvc9compiler.py	(working copy)
@@ -60,6 +60,51 @@
   </dependency>
 </assembly>"""
 
+_DIVMOD128_ASM = """\
+PUBLIC  _mpd_div_words
+_TEXT   SEGMENT
+q$ = 8
+r$ = 16
+hi$ = 24
+lo$ = 32
+d$ = 40
+_mpd_div_words PROC
+        mov     r10, rdx
+        mov     rdx, r8
+        mov     rax, r9
+        div     QWORD PTR d$[rsp]
+        mov     QWORD PTR [r10], rdx
+        mov     QWORD PTR [rcx], rax
+        ret     0
+_mpd_div_words ENDP
+_TEXT   ENDS
+END
+"""
+
+_DIVMOD64_ASM = """\
+.686P
+.model  flat
+PUBLIC  divmod64
+_TEXT   SEGMENT
+q$ = 8
+r$ = 12
+hi$ = 16
+lo$ = 20
+d$ = 24
+divmod64 PROC
+        mov     eax, DWORD PTR lo$[esp-4]
+        mov     edx, DWORD PTR hi$[esp-4]
+        div     DWORD PTR d$[esp-4]
+        mov     ecx, DWORD PTR q$[esp-4]
+        mov     DWORD PTR [ecx], eax
+        mov     ecx, DWORD PTR r$[esp-4]
+        mov     DWORD PTR [ecx], edx
+        ret     0
+divmod64 ENDP
+_TEXT   ENDS
+END
+"""
+
 @unittest.skipUnless(sys.platform=="win32", "These tests are only for win32")
 class msvc9compilerTestCase(support.TempdirManager,
                             unittest.TestCase):
@@ -128,7 +173,26 @@
         # makes sure the manifest was properly cleaned
         self.assertEquals(content, _CLEANED_MANIFEST)
 
+    def test_asm_extension(self):
+        from distutils.msvc9compiler import MSVCCompiler
+        import time
+        tempdir = self.mkdtemp()
+        cwd = os.getcwd()
+	os.chdir(tempdir)
 
+        cc = MSVCCompiler()
+
+        f = open('divmod.asm', 'w')
+        if cc.find_exe('ml64.exe'):
+            f.write(_DIVMOD128_ASM)
+        else:
+            f.write(_DIVMOD64_ASM)
+        f.close()
+
+        cc.compile(['divmod.asm'])
+        self.assertTrue(os.path.isfile('divmod.obj'))
+        os.chdir(cwd)
+
 def test_suite():
     return unittest.makeSuite(msvc9compilerTestCase)