Hey Adobe: Why the aggressive defaults from Illustrator?

Anyone else having the same problem?

Here's what's happening (on my Mac OS v10.11.6) :

I click a pre-existing .jpg, .png or .txt file and expect them to open the default apps I've used for years (Preview for jpg & png and TextEdit for txt) but lately I'm seeing Adobe Illustrator opening instead. WTH???

Okay, so I know how to "fix" this cr@p on a case-by-case (program) basis but it shouldn't be happening at all! What did Adobe do that is causing this mess with my system and how can I disable this default B.S. so that the app doesn't kick in at all? This is putting a damper on my workflow.

Any recommends for what I can do? Who I can talk to at Adobe or is person-to-person Adobe support nonexistent?

Thanks,

Edna

(BTW, I am on a Creative Cloud subscription and I use Photoshop way more than Illustrator.)