Looking For Help? Look No More!

[Homicide13]

I dont mean to bring this post back from the dead if it's supposed to stay there, but I have a question:

I'm trying to make a decal that is an entity (i want to take the blood splatter entitys and re-skin them). I have the .png file I want to skin them with, but I can't figure out how to do it. I tried opening the .dae file with notepad++ and changing the skin to the png file, but it doesn't work for some reason. (does it have to be .dds? i figured png would work) any thoughts?