The .xml files can simply be changed to .drm by right clicking and renaming the file with the .drm extension (or certainly that’s what worked for me in the past), however I maybe wrong!
To load the map, simply click the “Drum Map Setup” option where you normally select drum maps and click “Load” within the setup menu. Find the map you’re looking for and select it… that should be that?
I maybe wrong, but I’m sure there are plenty of people on here who can correct me if I am!