Question from a beginner user

[M1KES]

I wanted to start trying out my skills with game modding so i went and try opening a unreal moded file in 3ds max to see how people make the stuff. Problem is that max doesnt allow me to import any of the files of the characters (ukx, upx, upl). I even tried installing this actorx plugin but it seems that its only for exporting the models to unreal, what i want to do is the exact inverse. Would any1 by chance know how to open these files in max??