This is the name of a valid Announcement file which has been stored in the Announcement table as a permanent Announcement File name. This file name may include path or subdirectory information. The individual characters in this name may be alphanumeric characters, forward slashes, backward slashes, periods, dashes, and underscores, but no embedded spaces. Also, the last character of the name must not be a dash or a forward slash. However, single underscore character ('_') is considered a NULL string and should not consist cwAnnFileName name.