PCNTL compatibility to Windows?

Hello. I know that PCNTL extension is not compatible with Windows, but I can't found the reason for that. I mean, I know that it is a feature that Unix system could provide in a better way (natively I guess). But "why" Windows could not emulates this features and have a PCNTL support too? Even if it had a lower performance, it still could be useful on testing environments. So the question is: there are some hard limitation to it be impossible or would it be kind of a "lack of interest"? Thanks! -- David Rodrigues