CIA files (CTR Importable Archive) are a specific file format used on the for installing software directly to the console's internal storage or SD card. Unlike .3ds or .cci files, which act like physical game cartridges, .cia files behave more like digital installers or "digital copies." Key Characteristics
| Feature | .3ds | .cia | |---------|--------|--------| | | 3DS ROM image | CTR Importable Archive (CTR = 3DS codename) | | Purpose | Cartridge dump | Installable package (like .exe or .deb ) | | Installation | Cannot be installed; loaded via flashcart or emulator (Citra) | Installed to SD card or NAND via CFW | | Persistence | Volatile (runs from cart/SD) | Permanent (appears on HOME menu) | | File size | Typically smaller (no padding) | Often larger (includes metadata & tickets) | | Signature | No console-specific signature | Contains signed ticket & title metadata | | Use case | Preservation, emulation | Real 3DS with custom firmware | 3ds.cia files