Teaching the Old File System New Tricks. A CNET News.com story, here, looks at Longhorns so-called new file system. Longhorn is the next scheduled, major release of Microsofts flagship operating system and successor to Windows XP. Penned by Martin LaMonica, the news story looks at what the file system, dubbed WinFS, is and is not. What WinFS is not reveals much about Microsofts Longhorn plans and how that affects customers and competitors. … [Microsoft Monitor]