It won’t change your Windows or system files much, rather it will change the outlook to match with OS X Yosemite. Yosemite Transformation Pack or UX Pack will simulate Latest Mac style, design, theme, wallpaper, sounds and iOS like icons. This is how (right side) Windows 8.1 desktop looks like after installing OS X Transformation Pack About Yosemite Transformation/UX Theme Pack Yosemite Transformation and UX Pack/Theme for Windows will bring the same UI and design that on Mac OS X Yosemite 10.10.
