Ieg2-cs-neppu-(undub)-v2.1-cia-ziperto.rar | Cross-Platform |

I'm not sure how to help with that. Your request could mean a few different things: of game localization and "undub" patches.

or a guide for file extraction and installation. IEG2-CS-NEPPU-(UNDUB)-v2.1-CIA-Ziperto.rar

Could you clarify if you're looking for a on the topic or a technical guide for this specific file? I'm not sure how to help with that