The idea of changing the files of the game itself doesn't really sit well with me when the entire point of speedrunning a game is to complete the given game in the fastest time, not change how the game itself functions to make it go faster. I mean, I'd be okay with it being some side/misc category but I don't feel changing the file names in Windows should be allowed in the Main Any% category.

Actually yeah, makes sense when you put it like that.