I added
Outlaw Golf Holiday Edition (9 holes of Christmas) to a batch of games, and then when I booted up the DVD it surprised me by listing 2 additional Outlaw Golf items in the menu, both without screenshots.
I was puzzled at first, but then realized this is because the Outlaw Golf XMas CD has a total of 3 default.xbe files. One is a menu for launching Outlaw Golf XMas and several demo's, one is the main game, and one is a demo of or the retail Outlaw Golf. So it looks like MXM (or Craxtion... not sure) automatically checked the subdirs and added the default.xbe's it found.
If this is a feature, it would probably be preferable to be able to disable checking subdirectories.