Who cares! The user never sees them, they see the description from the file's title line, and a number to use to choose the entry. The file must be in the spool/tutor, spool/news, or spool/info sub-directories, depending on whether your wish this to be a general tutorial, a news item, or an information source. The file MUST have a ".tut" file extension to be displayed as a part of one of the Information Server menus.
When using TScript outside of the Information Servers, the filename has no restrictions at all.