This is great, but how do you mod MS+?!

A mod of Minesweeper Plus, instead of taking place in water, it is now on land! · By
Download GDRE Tools which allows you to decompile the game to get the file (a folder), then open the folder using Godot to mod the game. (I use version 4.4.1 of Godot.)
https://github.com/GDRETools/gdsdecomp
https://godotengine.org/download/archive/4.4.1-stable/
(Sorry for the late response, very busy with school and stuff)