If you want to open aai file without Illustrator, you can use the following steps:

  1. Open the file in a text editor such as Notepad or Word.
  2. Copy and paste the following code into Notepad:
  3. Save the file as aai.txt.
  4. Open the file in Illustrator and click on the File menu item to select “Open with…” and then select “AI File.”