Wait, perhaps "aio" is part of a software name, like "Audio Input Output" or something else. But the user wrote it as "aio for windows by niivu." Let me search for "aio Niivu Windows" to see if any products come up. Hmm, Niivu might be a company I'm not familiar with. Maybe it's a smaller developer or a specific tool in a niche area.
Windows does not support third-party visual styles by default. You must use a "patcher" to enable them. Choose one of the following: SecureUXTheme aio for windows by niivu