Standard retail 3DS games are encrypted to prevent unauthorized playback. While original hardware can decrypt these files in real-time, most emulators—most notably Azahar (the successor to Citra and Lime3DS)—require the files to be decrypted beforehand to run.
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: While .CIA files are often used for installing games directly onto a modded 3DS console's Home Menu, decrypted .3DS files are the preferred format for archival and PC-based play. The Best Collections on the Internet Archive Standard retail 3DS games are encrypted to prevent