[MM3-users] Header and footer templates in MM3

I read the earlier message from Peter Mueller about message decoration, and where the templates are in the file system. However, when I edit the header and footer templates in Postorius, those templates do not appear in the location specified. Should I be looking somewhere else? (I intend to write a program to rotate though several headers/footers, so I need to know where to have it write to.)

Gila Halpern