title: From where is taken Alpha 3 language extension in windows/delphi?
body: <p>Under delphi, when I click Project > Language > add I can see a list of language with an <strong>alpha 3 extension code</strong> (example: <code>afk</code> for Afrikaans, <code>aze</code> for Azeri, <code>fra</code> for french, etc.) Those alpha 3 code <strong>are not ISO 639-3</strong> alpha 3 code! so where are those alpha 3 code are coming from? those code seam to be related to windows and not to Delphi, but I can find from where exactly. </p>
  
  <p>Note: under Windows 10, the Project > Language > add show many languages with ZZZ as extension, like ZZZ for Dzongkha, what it's mean?</p>
  
  <p><a href="https://i.stack.imgur.com/r6uZ8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/r6uZ8.png" alt="enter image description here"></a></p>