Comment by canucker2016
Comment by canucker2016 8 days ago
from https://en.wikipedia.org/wiki/AARD_code
Microsoft disabled the AARD code for the final release of Windows 3.1, but did not remove it so it could be later reactivated by the change of a single byte.
DR DOS publisher Digital Research released a patch named "business update" in 1992 to bypass the AARD code.
I don't take Wikipedia as gospel, but that doesn't say what happened with earlier versions of Windows. And regardless, how did DR-DOS sue them if they weren't affected?