You can change the media player by going to View -> Preferences -> Media (click on right arrow next to the tabs in Preferences to get to Media). I do not know what you need to put in the command line to use Groove because I don't know the location of the Groove application in Windows 10, but you should be able to find that out. Here is the command line I use when I want to have iTunes as the default:
"C:\Program Files\iTunes\iTunes.exe" "%1"