yes like Uvah said winamp is the name of the player but i dont have a clue how skins are made for it but i do know some folks that do them
A lot of people here have done WinAMP skins over the years.
I stuck with 2.9x because anything after that was basically crap....and then TSF did far better work with WMP anyway.
There is a 'skin maker' for the 2x series...but it's absolute rubbish...and we don't accept skins made by it....because they are absolute rubbish.
The 2x series is 'simple'...but it requires you to understand what goes where....how...and why...and then to know your way around [any] graphic proggy that can do a bitmap...