In principle all do, with less features, as these features were not present in v.1.xx BS.Player.
Even 0.8 version skins still work in v.1.xx and v.2.xx BS.Player
(not the other way around).
Unzipped... how/what/why? What skin are you talking about?
BS.Players skins in fact are zipped
contents of folders.
However, with the extension .zip changed in .bsz
If you want to use an unzipped skin, all files should be in a folder.
The folder's name will be the name of the skin (like base skin).
