The runtime library does not provide any routines for copying a file. However, if you are writing Windows-only applications, you can directly call the Windows API CopyFile function to copy a file. Like most of the runtime library file routines, CopyFile takes a filename as a parameter, not a file handle. When copying a file, be aware that the file attributes for the existing file are copied to the new file, but the security attributes are not. CopyFile is also useful when moving files across drives because neither the RenameFile function nor the Windows API MoveFile function can rename or move files across drives.