I need some help

[jooker]

I'm not sure about that this is the right section but..
I'm playing on a SA RP server, and me and my friend have a mexican band. We collected some skins for that, but we'd  like to edit them. But I can't really do that with TXDW, it's blocked somehow.. any idea?
DL link for the skins:
http://www.filedropper.com/hdskinpackbybuci