To everybody who is having problems with the script: I cannot guarantee that it works with the latest version of WLM. I last tested it with version 8.1, and even then, it would only work occassionally.
Also: I did not write the original source code (this was written by Magic Rabbits). The original program was written in C# and it requires the .NET framework to work (you can download this original executable from the first post).
I simply translated this source code to a Messenger Plus! Live Script. Because the script runs from within the WLM process, my script does not require the .NET framework. However, it does exactly the same thing as the original C# program.
That being said, I have no spare time with school about to begin. Therefore, I will not continue to develop this script any further.
If anyone would like to have a go at fixing this script for later versions of WLM, by all means go ahead.
Until then, you will have to make do with practising on the Minesweeper game that comes with Windows in order to beat your friends.