Given it's an exe file it's already a compiled hack. It's going to be very difficult to deobfuscate it/unveil the code for what little I know about this type of a thing, I at least know that.
You could ask for assistance in the Sudden Attack section (https://www.mpgh.net/forum/forumdisplay.php?f=300) but it's quite dead. It's also very likely the hack you're trying to use is patched/outdated so that's what's causing the game to crash.