Thanks for the heads-up.
Even though this thread doesn't have much to do with Fallout 4 directly, I hope moderators let it stay in this section to spread more awareness to its fans so they can buy two great games and support Bethesda if they haven't yet.
They'd work just fine for Windows 8/8.1, what would make you think they wouldn't? I played Fallout 3 on Windows 8 and New Vegas on Windows 10. I'm also halfway through NV's story after 200 hours roaming around elsewhere and I can't say I fancy its storyline as much as 3's either, but some things like {possible spoiler alert!} the robot Yes Man made me crack up so much and {end possible spoiler} the mechanics are such an improvement, and I liked a lot of the new weapons and decisions you could make a lot more than in 3. Incredible DLC, by the way, you missed out big time.