1. Executive Summary OpenIV 3.1 is a definitive, multi-purpose archive management and modding tool designed for Windows versions of Rockstar Games’ titles built on the RAGE (Rockstar Advanced Game Engine). Released as the final major iteration of the 3.x branch, version 3.1 represents the most stable, feature-complete, and widely adopted modding foundation for Grand Theft Auto V , Grand Theft Auto IV , and Max Payne 3 . This report details its core architecture, key features, supported game versions, and its role in the modding ecosystem. 2. Supported Games & Version Compatibility OpenIV 3.1 explicitly targets the following game titles and their latest respective patches as of its release cycle: