You can also download game images directly in decrypted format from the internet. You have to convert the game images to this format before you load any game image to Citra. Note: Citra now supports game images only in decrypted 3DS format. Top 3 Free Nintendo 3DS Emulators for Windows 10 / 7 / 8.1
Citra 3DS Emulator is an open source 3DS emulator project developed by the most experienced emulator developers.