There is a smaller, yet notable, possibility that refers to a digital copy of Igo (also known as Go ), the ancient board game. In the early 2000s, several abandonware sites compressed classic Go game executables into RAR files. If the file size is under 50 MB, it is likely the game. If it is over 500 MB, it is almost certainly the GPS software.
Handle with care; it is not just a file—it is a piece of internet history. igo.rar