--- b.msvc9compiler.py	2009-12-19 17:20:50.000000000 +0100
+++ c.msvc9compiler.py	2009-12-19 17:21:13.000000000 +0100
@@ -315,11 +315,13 @@
     _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'
@@ -349,6 +351,10 @@
             raise DistutilsPlatformError("--plat-name must be one of %s" %
                                          (ok_plats,))
 
+        ml_name = 'ml.exe'
+        if plat_name != 'win32':
+            ml_name = 'ml64.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
@@ -357,6 +363,7 @@
             self.lib = "lib.exe"
             self.rc = "rc.exe"
             self.mc = "mc.exe"
+            self.ml = ml_name
         else:
             # On x86, 'vcvars32.bat amd64' creates an env that doesn't work;
             # to cross compile, you use 'x86_amd64'.
@@ -388,6 +395,7 @@
             self.lib = self.find_exe("lib.exe")
             self.rc = self.find_exe("rc.exe")   # resource compiler
             self.mc = self.find_exe("mc.exe")   # message compiler
+            self.ml = self.find_exe(ml_name)
             #self.set_path_env_var('lib')
             #self.set_path_env_var('include')
 
@@ -524,6 +532,13 @@
                 except DistutilsExecError as 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"