Rick
Fonts like Arial or Times Roman for example do not nesessarily contain special characters like ®, ©, etc., but fonts like "Symbols" contain all special characters. I think the need to insert special characters would be best served by an "Insert", "symbol", as used in MS Word. The core issue may be that Paint.net won't allow multiple fonts in a single line/string. This would explain this problem for you, as the ® symbol for example is from the "Symbols" font...