I wrote a small "reg" file to add Paint.NET to the list of "Default applications". I don't know the correct English name, I'm sorry for it, so let me show you, what I mean: You can simply download and run the attached "reg" file. Please tell me what you think about it? Maybe it's something for the installer? PS: The description is "Paint.NET" right now. It can be changed later... PaintDotNet.reg.txt