Windows 10 and 11 still support "Theme Packs," but Microsoft now offers "Windows Themes" via the Store. To get the classic feel:
“A key to what?”
using System; using System.Runtime.InteropServices; windows 7 regional themes
The following themes were available out-of-the-box in Windows 7 Ultimate, Professional, and Home Premium (depending on language edition): Windows 10 and 11 still support "Theme Packs,"