Shouldn't there be a windows release date since there was an "Enhanced CD Edition"?
Topic on Talk:System Shock
Was it released for Windows with the CD? And do you have a release date for it? If not, I think the Windows release date would just be whenever it was released on GOG.com.
EDIT: No GOG release, sorry. But the rest of my comment still stands.
The CD version was still DOS; there doesn't seem to be any Windows version.