What is the difference between the "Checkboxes (A)" and "Checkboxes (B)" dialogs in a Visual Studio setup project?

Question

In a Visual Studio Setup & Deployment Project, I can design the user interface for the installer. I have a welcome screen, a license acceptance dialog, and then an installation location dialog. All good.

I want to include one more dialog, to confirm changing of file associations. I think the way to do this is with a dialog that has a Checkbox.

I can right click the UI node, and select "Add Dialog" and I get this choice:

What is the difference between any of these checkboxes dialogs?

I tried to RTFM but couldn't find the doc on these options.

Answer 1

D'oh! I answered my own question.