. You might need a "3DS Decryptor" tool to make it playable. .3ds vs .cia .3ds files are standard ROMs often used for flashcarts or emulators. .cia files
Navigate to your file, select it, and choose > Build CIA from file . 7z to 3ds converter repack
Once extracted, you will find the .3ds (for emulators like Citra ) or .cia (for installation on actual 3DS hardware) file. : 7z to 3ds converter repack
There are several reasons why you might need a 7z to 3ds converter repack: 7z to 3ds converter repack