I don't use Vim so can't give feedback but this is a great thing. If anyone can test it I'd link to it on my page.

I always used Notepad++ and had my own highlighting file, but couldn't get it precise due to how limited my ability to define it was, and the program itself would break syntax highlighting a few megabytes into a script anyway. I've switched to VSCode with its NScripter syntax file and won't be wasting my time with Notepad++ again.