Did you accidentally attach the wrong file? This is just the .gifs.
Yes you are right...
extract the rar file to your E or C "images" folder using X-plore.
The smaler gif file is for wallpaper and that big one 2Mb size is the animation gif for the widget by miduPK
Install "gif animation widget_v1.00(0)_Belle_Signed.sis"
Then go to home screen tap-long add widget and it will be in widget selector.
To asign that small gif as wallpaper go to home screen where is the gif widget and go to settings "change wallpaper" -- and chose that picture with black borders it may be there.
then drag the widget to coordinates as on wallpaper...