Have you thought about making a aspell wrapping mod? http://prdownloads.sourceforge.net/aspell/aspell-.33.5-win32-i386.zip is the aspell bin for win32 systems, and it should run much faster than a perl based solution (as long as you develop it to load whole files not exec for each word) you may want to look at Lingua::Ispell for a baseline (I think aspell has been developed to behave very similar to ispell) I am not sure how much of a mod that will take to get it to work with aspell though. But none of this matters if your entire goal is to make a perl only spell checker module..

-Waswas