URL Rewrite to use virtual directories

Web.config

<configuration>
  <system.webServer>
    <rewrite>
      <rules>
        <rule name="subdomains" stopProcessing="true">
          <match url="^(.*)$" />
          <conditions>
            <add input="{HTTP_HOST}" pattern="www.saka-pon.net" negate="true" />
            <add input="{HTTP_HOST}" pattern="^([^.]+).saka-pon.net$" />
          </conditions>
          <action type="Rewrite" url="{C:1}/{R:1}" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>
</configuration>