In Windows Vista, you add the CopyFileBufferedSynchronousIo registry entry to improve the speed of a file copy operation. However, when you use Windows Explorer to copy a file from the Windows Vista-based computer to a computer that is running an older Windows operating system, the file copies only slightly more quickly.

Note: The file copies more quickly if you use a command-line tool to copy the file. You can use command-line tools such as Robocopy.exe and Xcopy.exe to copy the file.: