Hi.
The Microsoft folks responded back to me quickly. Here's what to do to
change the file association to use Winamp.
Go into Windows Explorer and select a file you want to open with Winamp.
Hit the context key, and select properties.
Now TAB until you find a change button and select that.
Here's where you can select Winamp as your player. I didn't see this option
in the selection dialogue, but I was told to check the always use the
program for this file type.
That's all there is to it. I'm a happy Windows 10 user now.
Have a great night.
Kevin Minor, Lexington, KY