On clicking a notification below the menu bar in VS2019 16.8.2, the Activity Monitor Log opens in Internet Explorer.
The Web Browser section in Options=>Environment only has an Internet Options link for IE. Internet Explorer will be retired soon, is there, or will there be provision for sending the log to an alternative browser, or even another program, e.g. this viewer?
One thing not attempted before posting the question was to try the suggestion at MS Docs:
And also here:
Clicking on the IDE to launch the log is as per file association. The xml extension was for some reason defaulted to IE on this rig.
So, not really a problem, VS launches the file correctly by default, and as per file extension settings.