A decompilation project for Harvest Moon 64 has appeared on GitHub under the handle harvestwhisperer. The repository, hm64-decomp, marks the first public steps toward reconstructing the original Nintendo 64 farming sim's source code from its binary.
Decompilation projects like this one are significant for preservation and modding communities. A successful decomp would allow the game to be studied, ported, and modified far more easily than cartridge-based hacking allows. The project is in its early stages, with an initial commit now publicly visible.