拡張子を省略してPHPアプリを呼び出す。 ref: http://qiita.com/kimama1997/items/af3d76110e6c67a3d96f

.htaccess

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php

Web.config

<configuration>
  <system.webServer>
      <rewrite>
          <rules>
              <rule name="omitted extension" stopProcessing="true">
                  <match url="^(.*)$" ignoreCase="false" />
                  <conditions>
                      <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />
                      <add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" />
                      <add input="{REQUEST_FILENAME}.php" matchType="IsFile" ignoreCase="false" />
                  </conditions>
                  <action type="Rewrite" url="{R:1}.php" appendQueryString="true" />
              </rule>
          </rules>      
      </rewrite>
  </system.webServer>
</configuration>