file but want it on your Home Menu, you can convert it to a CIA using tools like

Cannot be installed directly to the 3DS home menu without conversion. What are CIA Files? (.CIA format)

. These files are essentially digital installation packages, functioning much like an on Android or an installer on Windows. ftp.bills.com.au

Before CFW was perfected, users relied on flashcarts. These devices sit in the cartridge slot and read .3DS files off a microSD card. While still functional, CFW is generally superior today as it allows for CIA installation and online play (with risks).