Sacred Haven of Debauchery

Ar wants to say that by default, the game doesn't have the ability to save screenshots. Therefore, it doesn't actually capture the screen.

No. He wants to say that when you take a screenshot of Fallout using Print Screen + Paint, it captures a black screen, like in some old applications. The fact that a game from 1998 doesn't have a function to save screenshots by pressing the Print Screen key into a separate folder is self-evident.