I have a portable executable that saves data to a file in the same folder as the executable. Is there any way that I can save data into the executable itself when I close the ap
So right now you're using an app.config (and Settings.settings) file? I believe this is the most compact way to save data close to the .exe.
I would highly doubt you can alter the manifest of the .exe, or any other part of it.
Edit: Apparently, there might be some ways after all: http://www.codeproject.com/KB/msil/reflexil.aspx