Microsoft Windows SDK directory.

def WindowsSdkDir(self):
        """
        Microsoft Windows SDK directory.
        """
        sdkdir = ''
        for ver in self.WindowsSdkVersion:
            # Try to get it from registry
            loc = os.path.join(self.ri.windows_sdk, 'v%s' % ver)
            sdkdir = self.ri.lookup(loc, 'installationfolder')
            if sdkdir:
                break
        if not sdkdir or not os.path.isdir(sdkdir):
            # Try to get "VC++ for Python" version from registry
            path = os.path.join(self.ri.vc_for_python, '%0.1f' % self.vc_ver)
            install_base = self.ri.lookup(path, 'installdir')
            if install_base:
                sdkdir = os.path.join(install_base, 'WinSDK')
        if not sdkdir or not os.path.isdir(sdkdir):
            # If fail, use default new path
            for ver in self.WindowsSdkVersion:
                intver = ver[:ver.rfind('.')]
                path = r'Microsoft SDKs\Windows Kits\%s' % (intver)
                d = os.path.join(self.ProgramFiles, path)
                if os.path.isdir(d):
                    sdkdir = d
        if not sdkdir or not os.path.isdir(sdkdir):
            # If fail, use default old path
            for ver in self.WindowsSdkVersion:
                path = r'Microsoft SDKs\Windows\v%s' % ver
                d = os.path.join(self.ProgramFiles, path)
                if os.path.isdir(d):
                    sdkdir = d
        if not sdkdir:
            # If fail, use Platform SDK
            sdkdir = os.path.join(self.VCInstallDir, 'PlatformSDK')
        return sdkdir