The file has likely been patched to remove region locks, allowing it to run on any 3DS console regardless of its original region (e.g., PAL or JPN).
"Ziperto" refers to a well-known third-party repository for Nintendo console ROMs and homebrew software. Important Technical Notes MHG-USA-CIA-RF-Ziperto.part1.rar
Once extracted, the resulting single .cia file is installed to the SD card. Unlike .3DS files used for Citra emulator, .cia files appear directly on the 3DS HOME Menu after installation. The file has likely been patched to remove