The filename refers to a compressed archive containing a digital copy of the Nintendo 3DS game New Super Mario Bros. 2: Gold Edition . Based on the file naming convention, Core Content
: A compressed folder format; you would need a program like WinRAR or 7-Zip to open it and extract the .cia file.
: Indicates the game is the North American region version.
: This is the base game featuring the "Coin Rush" gameplay mechanic.
: The file format inside the archive is a .cia file, which is used for installing software on custom firmware (CFW) Nintendo 3DS systems.
: Abbreviation for New Super Mario Bros. 2 Gold Edition .