File type exclusion syntax?

Hi.  I can't seem to find an example in any Norton documentation, and just want to be sure.  I want to add an exclusion for a file type, for example *.txt.  The exclusions dialog does allow adding *.txt, but all the help I could find seems to suggest only full paths to files are supported.  So my question is, are entries like *.txt properly supported as exclusions (and with or without the *)?  Thanks