Thanks, frederf!
Unfortunately, I'm not entirely sure of how to configure an external player, as you have done.
Do I simply take the address of a desired player such as:
"C:\Program Files\VideoLAN\VLC\vlc.exe"
Then, add a forward slash and the word "/PLAY" on the top line, and "/ADD" on the bottom line, followed by "%1"?
Is that it?
Thanks very much for any additional instructions.