UIS1 is a simpler, and therefore more limited, skin format. It's benefit is that it's more compatible with apps that might have trouble with WB skins, like Photoshop. It only allows standard window border sizes (3 or 4 pixels wide) and standard button placement. It's generally believed to be faster too although I'm not sure that's true anymore. I would highly recommend making one as a sub skin, or if your skin design is 'standard' enough just make the main skin a UIS1. It makes a very easy way to optimize the performance of your skin though I would still suggest using indexed color for your bmp's as well.
In Skin Studio you can convert a skin to the UIS1 format. You'll probably need to open it in skin studio after creating it and fix a bunch of stuff like the border sizes and some of the images.
https://www.stardock.com/products/windowblinds/skinning/
Towards the bottom of the menu are the references I believe you're looking for. Caution: This site has not been updated in a while so it's not a completely reliable reference, in my opinion, but it's a decent start. I personally haven't found it to be in error so much as incomplete.
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