I don't know, I would hate to wake up in space one fine morning and see the "blue screen of death" looking at me
No “Blue Screen of Death” with DOS - that was a Windows innovation. DOS was actually a pretty stable OS. After it ceased to be a home computer operating system, people were still using it in embedded systems, and (as in this case) to control scientific instruments. Nowadays they use Linux for that, so DOS is pretty much dead. Then again, NASA is always several years behind the times.