This is exactly the kind of thing Microsoft likes to opensource: old, crusty, and obsolete. Let's compare. When ID Software opensourced Doom a few years after it's initial release, there was still some life in it and it spawned a myriad of forks and new developments continuing to this day. An active community formed around it. When Microsoft opensourced MSDOS, an opensource clone had existed for so long it was only of interrest to archeologists and historians. It was as whitered and lifeless as Zork is.