After conducting a search for "bplnex", there is by that exact name in public records or major search databases.
If you are looking to get into modding, what is the first game you want to try modding with ? I can help you find specific resources for that game. Communauté Steam :: Guide :: How to make mods with BepInEx
BepInEx/BepInEx: Unity / XNA game patcher and plugin framework
: Launch the game once. BepInEx will automatically generate necessary folders, such as plugins and config , and then close the game.