DEDUPEDAuthorization notice. universal-modder is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.
Who it is forTinkerer who wants to swap textures or data in an older game but cannot open its files
The problemProprietary archives and formats have no documentation, so editing assets is impossible without reading the binary.
The outcomeA working reader and writer for the format, proven by unpacking and repacking a file and getting the same game behavior.
What you need first
- A coding agent such as Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot or OpenCode
- A PC game you own, run single-player or offline
- Git, Python 3.10+ and ffmpeg (uv recommended)
- A fal API key for generated art, 3D and audio (or a local ComfyUI server for images)
- Blender for 3D to sprite renders
- Windows games run natively or from WSL
Steps
- Install the plugin and point the agent at the game folder and the file type.
- Ask the reverse-engineering skill to analyze the format with its tools such as ILSpy, Ghidra or Cheat Engine as appropriate.
- Have it write a script that reads the format and a writer that rebuilds it.
- Verify with a round trip: unpack, repack, and load the result in the game.
Prompt for your agent
Use universal-modder's reverse-engineering skill on the <file type> files in <path to game>. Work out the format, write a reader and writer, and prove it with a round trip that still loads in the game.
Caveat. Only for games you own and local single-player use. Do not redistribute extracted game assets, and do not use it to defeat anti-cheat or cheat other players.
About universal-modder
Skills that let a coding agent mod almost any PC game you own. Part of this week's top 10 repos: ranked #7 on Repo Radar. View rehan-remade/universal-modder on GitHub.
More with universal-modder
- Turn a finished mod into a reusable field note Record the engine, route, versions and gotchas of your mod and open a pull request so the next agent starts ahead.
- Add a custom weapon or boss to a game you own Describe a new item or boss in plain words and have the agent build it, with art, and test it in the running game.
- Cut a showcase video of your finished mod Record the game window with only game audio, pick the best moments and edit a styled clip.
- Find a game's engine and see if it was modded before Point the agent at a game folder to get the engine, version, modding route and any existing field notes.
- Put one game's content inside another game Port characters, vehicles or mechanics from one game into a second, like Minecraft mobs in GTA V.
- Make sprites, 3D models and sound for a mod with fal Generate engine-ready sprites, 3D models, sound effects and music for a mod instead of drawing them by hand.
- Port an existing mod to a newer game version or loader Move a mod from an old Minecraft version or loader to a new one without behavior drifting.
Disclaimer
Deduped lists open-source repositories that belong to other people. We do not own, maintain, audit, or vouch for any of them, and a repo appearing here is not an endorsement or a safety check. The use cases, steps, and prompts are written by AI and may be incomplete, outdated, or just wrong. Where a use case is marked "Seen in the wild", we link to public posts where someone described something similar, but we have not verified those posts and the use case itself is still our AI's own write-up. Use all of this at your own risk. Only run code, commands, or agents on systems and accounts you are authorized to use, and read the code and every command before you run it, especially anything that touches credentials, files, or the network. Nothing here is professional, security, legal, or financial advice. All trademarks and project names belong to their respective owners, and their use here does not imply affiliation. Content is provided as is, without warranties of any kind. Found a mistake, a safety problem, or something you want removed? Email [email protected] and we will look at it promptly. Full disclaimer page