I came across this program a while ago myself, and was just as amazed by its premise. I looked at the source code, and saw lots of involved low-level NT kernel voodoo I don't understand, instead of the code I tend to use to solve this kind of problem. Truly, this must be an amazing piece of software, I thought... until I tested it with th135 and noticed that it rendered the Music Room text as exactly the same garbage you see when running the game without any locale emulation. Yeah, it did display 東方心綺楼 in the title bar and correctly referenced the 御首頂戴帳 folder, but overall I'd consider this to be a worse alternative to AppLocale.
So I did some research, and it turns out that this thing merely implements the bare minimum of functionality necessary (namely, changing the system ANSI code page in memory) to purportedly keep games from crashing. Anything just a bit more involved