Right-click part1.rar and select "Extract Here" using a tool like or 7-Zip .
This specific file name suggests it is a CIA format for a modded 3DS. If you are trying to play this on an emulator like Citra , you may need to decrypt the file after extraction if it isn't already "Region Free" or "Decrypted." MHXX-(UP110-ENGP21)-JPN-CIA-RF-Ziperto.part2.rar
When the prompt asks for a password, enter ziperto.com in lowercase. Right-click part1
For files sourced from , the extraction password is almost always: ziperto.com How to use it: MHXX-(UP110-ENGP21)-JPN-CIA-RF-Ziperto.part2.rar