Enhanced Windows dictionary options?

FWIW, try these (Windows 3 beta):
[url][LH2794] Spell checker dictionary not up to standard?]

[url][JH] Dictionaries - Portuguese]

[url][NB] On dictionaries...]

I use this one at the “insane” level (English only)
Of course, after each update of the beta you will need to put your dictionaries back in the right spot and remove/replace the installed dictionary.