[help] Media.pk2

[sbhtkvnkl3]

hey all i want to change my "select" this is the Blue circle thet Appears when you click on the floor. and i find image thet i want to use for it. but i dont konw in
what format to save the image i try .ddj i dont see the select in game at all...
and when i select it on the media pk2 editor i get eror so in what format save the image to be able to use it and see in game.

i change this file in media pk2
select_01
select_02
select_03
select_04