title: mime_content_type returning text/plain for css and js files only
body: <p>I'm encountering this weird issue with PHP's mime_content_type, it works fine, except for CSS and JavaScript files, which it returns text/plain for (PHP's default mime is set to do text/html).</p>
  
  <p>Modifying the mime.types file seems to make no difference (its path on httpd.conf is correct).</p>
  
  <p>Examples</p>
  
  <pre><code>&lt;?php
    echo(mime_content_type('index.html')); // returns text/html
    echo(mime_content_type('default.png')); // returns image/png
    echo(mime_content_type('bootstrap.min.js')); // returns text/plain
    echo(mime_content_type('css/animate.css')); // returns text/plain
    echo(mime_content_type('css/style.css')); // returns text/x-asm
  ?&gt;
  </code></pre>
  
  <p>The same exact files served on the same exact Apache installation gets correctly marked on their <code>Content-Type</code> headers, it's almost as if PHP's using its mime detection mechanism.</p>
  
  <p>I'm using <code>Wamp 3.0.6 64-bit</code> and the built-in <code>PHP 7.0.10</code> on <code>Windows 10 64-bit build 15063.483 mod_mime and mode_mime_magic</code>
   are enabled.</p>