First, I should confirm whether they're looking for a ROM of Lemur for the 3DS. But I also need to be mindful of legal issues. ROMs are copyrighted, so distributing them is against the law unless the game is abandonware, which isn't clear. The user might not know the legal side, so I need to explain that while helping them if they have a legitimate copy.
Lemuroid will scan the directory and automatically categorize your 3DS games with box art. 4. Bios and System Files lemuroid 3ds roms