Hello! So, I generally can figure this out. Creators will add a character in the code that blocks it from opening in PMX. Which you can remove in a program like Notepad++. But, this one has me quite puzzled. You can DL it here(Maybe you have already):
I have no idea! I spent a long while checking through other ones to try and match in order to see if anything was different(In addition to just taking many shots in the dark removing/changing characters seeing if it would work). But, nothing came up. If one of you guys know how to fix it, that would be great!