Skin Folders within the .zip are to be installed just as any other addon would be (placed in to the /AddOns/ folder).
Skins will then be loaded up and recognised by WIM.
What does this pack do?
This is a pack of 15 skins for WoW Instant Messenger (WIM). Once installed, when you go into your WIM Options, you will be able to choose from a few additional skins to change the look of WIM.
WIM Skin Discussions?
If you wish to discuss or share ideas and thoughts about skinning WIM, please visit the official WIM Skinning Forums.
Hope you enjoy.
What else has there been?
WIM Skin Suite, it is available here: Download Link.