Standard Windows backgrounds can't play animated "packs" on their own. You first need one of these tools:

: A popular open-source option available on the Microsoft Store. It supports hardware acceleration and can even turn websites into wallpapers.

Downloading a usually involves two steps: getting a "player" app (like Lively Wallpaper or Wallpaper Engine ) and then downloading the wallpaper files (often in .mp4 or .mlw formats) to put inside it. 1. Essential Tools (The "Players")