The file w_ohack.zip contains Hack for Windows. This is a version of
the original Hack game, one of NetHack's predecessors. To run it, you
need MS-Windows AND a special command shell, w_one49. You can find this
file on following location, and on a lot of mirror sites as well:

  ftp.cica.intiana.edu:/pub/pc/win3/utils/w_one49.zip.