>>I do not know John, I see your point as a reason to have the discussion about the legality of decompiling (or using a decompiled) product here, so we can make an informed decision whether to use it or not

IMHO MS isn't an overbearing legalist monster like some others. Their EULA specifically acknowledges that the prohibitions are not absolute and that there are permitted uses, which makes it harder to assert EULA breach to justify license cancellation which puts you in jeopardy of public policy and copyright breach. Full credit to MS for that.

>>(FWIW, I do not see how can I be held accountable for someone else decompiling a product, how would I know? Well in this case we know, but it will need to be proved on court, jeje)

My understanding is that the amount in controversy/damages need to exceed $75K to mount a claim in Federal Court- unless there's public policy specifically allowing a claim, e.g. for copyright. Hence earlier credit to MS for not angling at that, and a challenge to assert $75K damages if (for example) somebody fixes the issue referenced in the APPEND GENERAL and Windows 10 thread.