Installation on Windows, -R to onsgmls not supported?

This looks suspicious to me:

http://validator.w3.org/docs/install_win.html#adaption-of-check
"The option -R has to be deleted"

Really?  Bad from security POV on any OS, I guess.  Doesn't even a
recent enough onsgmls support -R on Windows?

By the way, that doc needs a language lawyer...