MIT – free for personal and commercial use.
[Link to releases]
ULCFG files are typically used with Wii USB loaders (like USBLoader GX) to store per-game settings (video mode, language, Ocarina cheats, etc.).
They are not a native PS2 format. ulcfg ps2 editor
If you're seeing a .ulcfg file on a PS2 context, it might be: MIT – free for personal and commercial use
Cause: Accidentally enabled an incompatible mode (e.g., Mode 3 – Unhook syscalls on a game that needs syscalls).
Fix: Open the ULCFG editor again and disable all modes. Start with only Mode 6 or none, then re-enable one by one. ULCFG files are typically used with Wii USB