When I put WinAMP controls in my WB skins...way back when they were first done, it was with notepad.
;**** WinAMP control buttons ****
[Button11]
XCoord = 180
YCoord = 4
Align = 1
Action = -4
DllName = BlindJafo\WBAmp.dll
WBAmp = 22
ButtonImage = BlindJafo\amp-open.bmp
Visibility = 5
Visibility1 = 1
[Button12]
XCoord = 196
YCoord = 4
Align = 1
Action = -4
DllName = BlindJafo\WBAmp.dll
WBAmp = 6
ButtonImage = BlindJafo\amp-ff.bmp
Visibility = 5
Visibility1 = 1
[Button13]
XCoord = 212
YCoord = 4
Align = 1
Action = -4
DllName = BlindJafo\WBAmp.dll
WBAmp = 3
ButtonImage = BlindJafo\amp-stop.bmp
Visibility = 5
Visibility1 = 1
[Button14]
XCoord = 228
YCoord = 4
Align = 1
Action = -4
DllName = BlindJafo\WBAmp.dll
WBAmp = 2
ButtonImage = BlindJafo\amp-pause.bmp
Visibility = 5
Visibility1 = 1
[Button15]
XCoord = 244
YCoord = 4
Align = 1
Action = -4
DllName = BlindJafo\WBAmp.dll
WBAmp = 1
ButtonImage = BlindJafo\amp-play.bmp
Visibility = 5
Visibility1 = 1
[Button16]
XCoord = 260
YCoord = 4
Align = 1
Action = -4
DllName = BlindJafo\WBAmp.dll
WBAmp = 5
ButtonImage = BlindJafo\amp-rew.bmp
Visibility = 5
Visibility1 = 1
That dates back to about '99...