I just announced "OS" and "OS-Windows" project for Pharo. Hope it is useful for others too and community will help to move better external support in Pharo forward. Project and code lives on:
If you have Pharo 3.0 installed just open "Tools" -> "ConfigBrowser" and install "OSWindows".
You should follow the examples given in the documentation that you can find on the project page. Just scroll down there.