Directly from the FAQ, which is located as the very first post at the top of the message board:
What programs will I need to download to start using skins/themes?
Every skin and/or theme has to have a program in order to be used. For example, if you have downloaded
a WindowBlinds theme, you will need the WindowBlinds program to apply it. For Sysmetrix skins, you will
need the Sysmetrix program. (See a pattern here?)
Every section/library has an "About" section near the top of the page, with links to the downloads.
What are these odd file extensions?
You're probably wondering about extensions such as .wba, and .dxtheme. These are nothing more than renamed .zip files, and are proprietary to the programs they work with. Here is a short list, that I will add to as I can.
.hvd = HoverDesk
.wba = WindowBlinds
.logonxp = LogonXP
.ipz = ICQ Plus
.obpack = Objectbar
.wsz = WinAmp
.wal = WinAmp3
.xptheme = WinStyles Theme
.suite = WinStyles Suite
.bnskin = BeatNik
.curxptheme = CursorXP
.dxpack = DesktopX Objects
.dxtheme = DesktopX Theme
.iptheme = IconPackager
.mmz = MusicMach Jukebox
.wst = NextSTART
.wsw = WorkShelf