xBrunoMedeiros/RODumper ? reverse-engineered prompt

Build me a simple Windows DLL for Ragnarok Online that can replace the game’s existing gepard.dll and dump all GRF files that are loaded in game.

I want it to be easy to use, so the flow should be, rename the original gepard.dll to gepard.bin, drop in the new DLL, then press F1 on the login screen to start dumping. It should save out the loaded GRFs cleanly and reliably, without crashing the game if possible.

Please make it feel like a small, practical tool rather than a full app. If you need to look up any current docs or game related details online, go ahead. Keep the code organized so it is easy to build and understand, and make sure it matches the README instructions for usage.