WinStyles currently supports two types of theme formats:
.suite
and
.xptheme
What is the difference
WinStyles was designed to let people seamlessly create their own desktops using a variety of programs and then package them up together.
A .XPTheme file is basically like an extended MS theme file. It actually contains the skins, icons, themes, etc. So they tend to be large.
.SUITE files on the other hand are just a few hundred bytes because they basically just link to skins, icons and themes on the Internet.
When to use which?
When you upload a .xptheme file, you are literally distributing those skins and icons. That means you
must own those skins, icons, and themes included or have permission to distribute them.
Therefore: Only submit a .xptheme file when you have permission to distribute the contents or own the contents.
.SUITE files are a convenient way for someone to create a great screenshot and say "I got this by using Joe's WindowBlinds skin, Eric's wallpaper, Brian's Icon package, Sally's DesktopX theme, and Kevin's WinAmp skin." A user just downloads the .suite and it asks which parts they want to use and it goes off, downloads them automatically and applies them.
HOWEVER:
There is a time when you might want to use .suite files when you own all the contents:
If your suite contains many many different skins, icons and themes and therefore the file size is really large a .SUITE file may make sense because then the user can picka nd choose which parts they want to use before it goes off and downloads those parts.
A good example is Chad Ross's WinStyles theme. He owns most of the contents but because it's around 9 different icons, themes, and skins in there it would be huge as a .xptheme so Chad lets the user open it up and decide which parts they want (I don't have some of the programs installed that he supports for instance so I don't want to download all that stuff).
Summary
Don't upload .xptheme files that contains things you don't own. And don't upload .suite files that contain just your stuff in which there's only a few skins in there.
It would be great to see more people make use of this. If you haven't tried WinStyles, I highly recommend it - http://www.winstyles.com.
I uploaded a new .suite file today that makes use of Alexandrie's skin, someone else's wallpaper, an objectbar theme I made and a couple other things.
Have fun!