title: What are the different 'content_type' for Active Storage?
body: <p>Where can I find a list of all the different <code>content_type</code> category that Active Storage has? I am trying to change an icon based on the file type.</p>
  
  <p>For example:
  In the <a href="https://edgeguides.rubyonrails.org/active_storage_overview.html#attaching-file-io-objects" rel="nofollow noreferrer">documentation</a>, there is <code>application/pdf</code>. I have also seen that there is <code>image/png</code>, <code>video</code>, <code>audio</code> or <code>text</code>. What interests me is the part before the file extension (therefore <code>image</code> or <code>application</code>). In which category would a Word or Powerpoint document be for example? How many <code>content_type</code> category there are?</p>
  
  <p>Thank you in advance!</p>