In general, ArchiCAD replaces invalid characters (eg. #&@) with a '_' character, if they are in the filename. It might also happen, if there are special characters in the path of the destination folder.
Moreover, the Include Project Reviewer Environment option in the Publisher Set Settings only allows characters that are compatible for Web display.
It means that only western characters, numbers and '_' are allowed in either the file-/Publisher Set name or in the destination path folder.
However, when this option has once been selected and deselected again, it will not be refreshed. The path or file name has to be changed and renamed manually.
I hope I could be of help.