To the standard player, this ID is irrelevant in daily play. However, to those who wish to "mod," "cheat," or engage in "high-quality" technical manipulation of the game—beyond the standard golden tools—this ID is the key to the kingdom. It is the folder name used by save editors, emulators, and custom firmware (CFW) to locate and alter game data. This guide will look at "High Quality" from both the in-game perspective and the technical, modding perspective.
Below is a comprehensive, 1,500+ word high-quality article.