79 votes68 comments · Illustrator Bugs » File Save, Import and Export · Flag idea as inappropriate… · Admin →
We have this issue fixed, please refer to steps below to solve the issue
XD defaulting to AI on Windows
- Please update to latest version of XD (13.1.32) to resolve the issue. Thank you XD engineering team for solving this issue.
PS defaulting to AI on MAC
CJ Keller commented
- Please update to latest version of Illustrator (23.0.1) to solve this issue.
I had the same problem. I fixed by selecting an .ai file. and getting information (Command I on Mac). Under "Open with" I changed to Adobe Illustrator CC 2019. Then hit the "Change All" button and it did the trick. Now allow my .ai files open in Illustrator when I double click on them.