That filename is a fascinating artifact. At first glance, it looks like a standard, if slightly suspicious, Wii ROM file for Mario Power Tennis (the NTSC version, sized at 1478MB, in WBFS format).
(Or should we combine elements?)
That extension doesn't belong there. It immediately suggests a few possible story hooks. Mario Power Tennis -RMAE01- NTSC 1478MB WBFS.dragon
But the magic is in that last part: .