These uploads are often split into 7z or RAR parts and include metadata files (title IDs, region codes, firmware requirements).
As of late 2025, the landscape is fragmented. You cannot simply go to Archive.org and search "Super Mario 3D Land decrypted" and expect a direct hit. Decrypted 3ds Roms Internet Archive
Use FBI (the CIA installer) on your 3DS to install the game. Emulation (Citra): These uploads are often split into 7z or