For power users, QuickBMS is a universal archive extractor. By using the specific rpg_maker_rgss3.bms script, you can handle even modified or "hardened" encryption.
This is a popular open-source utility that features a "drag and drop" interface. It’s the most user-friendly way to get results without touching a line of code. extract rgss3a files better
It bypasses many of the custom "anti-tamper" measures developers occasionally add to their archives. Step-by-Step: The "Clean" Extraction Method For power users, QuickBMS is a universal archive extractor
Extraction is only half the battle. To make a game "playable" in the RPG Maker editor after extracting, you need a Game.rvproj2 file. You can usually create a blank project in VX Ace and copy its .rvproj2 file into your extracted folder to trick the editor into opening it. Ethical Note For power users