BepInEx. ... BepInEx is a plugin / modding framework for Unity Mono, IL2CPP and . NET framework games (XNA, FNA, MonoGame, etc.)
It uses tools like Mono.Cecil to modify game assemblies in memory, further reducing the risk of game file corruption.
Unlike older methods that required replacing game files (e.g., using dnSpy ), BepInEx injects code at runtime. This allows multiple mods to run simultaneously without permanently altering the game’s core files.
Based on current data, "BPLNEX" appears to be a common misspelling of (Bepis Injector Extensible), a widely-used modding framework for games built on the Unity and .NET engines.