How do you create an extension .aix

How can i create an extension(.aia)?
i want to create an extension i want to know how to start.
all help will be accepted. :grinning:

Here is one guide:


I revamped the page to include more detailed instructions and some explanations. If you would like to suggest some amendments you are welcome to share it here. Do note that I am now using Extensions Template and I have a lot of schoolwork, so questions may be delayed for a little time.