There is only one file type that uses the .UIS extension:
WindowBlinds User Interface Specification
Contains instructions for processing skins (.WBA files) for Stardock SkinStudio or WindowBlinds; defines skin parameters, such as the appearance, visibility, positioning, and actions.
UIS files are written in the UIS skin design language and can be edited with a text editor. Simple designs may be saved in the WindowBlinds UIS file format, while advanced designs are typically saved in the WindowBlinds UIS2 format.
Updated: September 1, 2008