Windows Longhorn was Microsoft's codename for the operating system project that eventually became Windows Vista, discussed widely in the early 2000s before a major development reset in 2004. Because no official Longhorn startup sound was ever released for a finished product, fans created their own imagined versions and shared them online, especially alongside mock boot screens and concept videos. This fake version became a small niche reference among retro tech fans, often paired in edits with computer error sounds and other system noises from the Windows XP and Vista era.