Recompiled Luigi's Mansion into a native Windows port with experimental online co-op

LmCoop is a native Windows recompilation of the GameCube title Luigi's Mansion, based on the rob646464/luigis-mansion-recompiled project. The software provides a custom start menu for singleplayer and multiplayer modes, alongside experimental online co-op functionality. Users must supply their own USA disc dump (GLME01 revision 0) to build the game module locally. The project implements native mouse support for camera turning and flashlight aiming, replacing the original C-stick input logic with direct hooks into the game's rotation and pitch routines. Online play requires both participants to use the same build version and connect via a VPN or reachable network address. The author reports that full campaign synchronization remains unverified and experimental. Development involved AI assistance, with commit history documenting contributions from Claude Sonnet 5.5 and Claude Opus 5.5. The project documentation is available at https://raw.githubusercontent.com/recoi1/lmcoop/HEAD/README.md.