A sequence of Unicode characters containing the file name. When working with this field, use FileNameLength to determine the length of the file name rather than assuming the presence of a trailing null delimiter. If the RootDirectory member is 0, this member MUST specify a full pathname to be assigned to the file. For network operations, this pathname is relative to the root of the share. If the RootDirectory member is not 0, this member MUST specify a pathname, relative to RootDirectory, for the new name of the file.