Trying to open .uasset file in UE 5.1

I have been working on creating a simulation project where i had to import some assets from a github repository from a research paper into my own project.
First i tried copy pasting them in the contents folder and only the mesh folder shows up which is empty.
Tried dragging dropping the assets directly into the contents folder in unreal engine and it throws the error
.UASSET unknown extension.