You may be right. I've installed W11 to a few friend lately, and I think also GOM Player may break this too (or VLC... not sure)
Things sometimes change in the operating system from time to time, which is fine. Some things work differently.
And yes, these apps may have used a method doing something, that was not... the intended way, yet worked.
(did some registry stuff on the own accord and it worked so far)
But.... I still think, that this functionality should not break this easily. Especially as multiple apps may do this.
So this is nice example of something not being Microsoft's fault... yet they'll gt the blame, and they will need to come up with an idea to fix this eventually.
(or people will update ther installers eventually, and this topic will be pretty popular up to that point :D )
The software engineer's life is never easy :D
I'll take a few seconds, and try to notify the creator or Irfanview about this :)
Have a nice day, and thank you for the insight!