Etrian Odyssey Untold: The Millennium Girl (EOU-TMG). This is a role-playing game developed by Atlus, combining dungeon crawling with a structured story mode.
The file has been "decrypted," meaning the Nintendo 3DS encryption has been removed. This allows the game to be played on PC or Android emulators like Citra , rather than requiring a modified ("hacked") physical 3DS console. EOU-TMG-(UNDUB)-DecrTD-Ziperto.rar
Here is an informative breakdown of what this file represents: Etrian Odyssey Untold: The Millennium Girl (EOU-TMG)