The file is a compressed archive containing a "legit" CIA file for Luigi's Mansion: Dark Moon (LMDM) for the European (EUR) region.
To use this file on your Nintendo 3DS, you must first extract the archive on your computer and then install the resulting .cia file using a modded console. 1. Extract the CIA File LMDM-EUR-Legit-CIA-Ziperto.rar
Download and install an archive extractor like 7-Zip or WinRAR. The file is a compressed archive containing a