Tweak UI is a free user interface customization application first release by Microsoft in 1996 to aid end users in customizing the Microsoft Windows operating system. By itself, it does not do anything that would not otherwise be possible. However, it provides a simple graphical user interface for performing tweaks that otherwise would require editing the registry, which is considered by many a daunting and risky task for novice users. Tweak UI is a free download from Microsoft's website, and is one of many non-supported PowerToys released by Microsoft.