JohnTwilley
Hot Shot
Hot Shot

Bingo.

DEM 9.10 Default File Associations will NOT work if you have a policy to "Do Not Process the run once list"

We had added that to prevent OneDrive and other apps from installing post login.

I now see the FlexEngine-DefaultApplications.log, which is created a few seconds after getting a desktop.  Thanks for clarifying the process.

Annotation 2020-01-10 125318.png

Per User file type associations are now working as expected.