FYI - Thought I'd put it out there...
This is pai's old pnp code that I checked a few years ago under mIRC 7.x and afaik still works:
https://github.com/peace-and-protec...6840eac0b7/pnp-spellchk/spellchk.mrc#L39Caveat: Haven't checked it now, not sure if it's still working...