The link in the post to NTVDMx64 at Columbia seems to be broken, but the associated GitHub project appears to be at https://github.com/leecher1337/ntvdmx64

  "What is it?
  ===========
  NTVDMx64 is a port of the well-known Windows NTVDM, which is used by windows 
  to run DOS-Applications, to 64bit Windows, so that you can run your 
  DOS-Applications on 64bit Windows too."

Something I had wanted and didn't know existed!